diff --git a/build.gradle b/build.gradle
index 4964fa3cfd..f61001f29d 100644
--- a/build.gradle
+++ b/build.gradle
@@ -39,7 +39,7 @@ allprojects{
         if(!project.hasProperty("versionType")) versionType = 'official'
         appName = 'Mindustry'
         steamworksVersion = '0b86023401880bb5e586bc404bedbaae9b1f1c94'
-        rhinoVersion = '3c6bbadf73a904eefcc28b6fd8aa742ac575e878'
+        rhinoVersion = '73a812444ac388ac2d94013b5cadc8f70b7ea027'
 
         loadVersionProps = {
             return new Properties().with{p -> p.load(file('../core/assets/version.properties').newReader()); return p }
diff --git a/core/assets-raw/sprites/blocks/units/tank-assembler.png b/core/assets-raw/sprites/blocks/units/tank-assembler.png
new file mode 100644
index 0000000000..5bf4b32783
Binary files /dev/null and b/core/assets-raw/sprites/blocks/units/tank-assembler.png differ
diff --git a/core/assets-raw/sprites/blocks/walls/tungsten-wall-large.png b/core/assets-raw/sprites/blocks/walls/tungsten-wall-large.png
index 4c21bf939c..d5a14f7432 100644
Binary files a/core/assets-raw/sprites/blocks/walls/tungsten-wall-large.png and b/core/assets-raw/sprites/blocks/walls/tungsten-wall-large.png differ
diff --git a/core/assets-raw/sprites/blocks/walls/tungsten-wall.png b/core/assets-raw/sprites/blocks/walls/tungsten-wall.png
index e9c0c18e33..1e57bcea46 100644
Binary files a/core/assets-raw/sprites/blocks/walls/tungsten-wall.png and b/core/assets-raw/sprites/blocks/walls/tungsten-wall.png differ
diff --git a/core/assets/logicids.dat b/core/assets/logicids.dat
index ee0c940a98..e5d28945ab 100644
Binary files a/core/assets/logicids.dat and b/core/assets/logicids.dat differ
diff --git a/core/src/mindustry/ai/types/CargoAI.java b/core/src/mindustry/ai/types/CargoAI.java
index bc5aca07f6..f9572b9c3f 100644
--- a/core/src/mindustry/ai/types/CargoAI.java
+++ b/core/src/mindustry/ai/types/CargoAI.java
@@ -29,6 +29,8 @@ public class CargoAI extends AIController{
 
         var build = tether.building();
 
+        if(build.items == null) return;
+
         //empty, approach the loader, even if there's nothing to pick up (units hanging around doing nothing looks bad)
         if(!unit.hasItem()){
             moveTo(build, moveRange, moveSmoothing);
diff --git a/core/src/mindustry/content/Blocks.java b/core/src/mindustry/content/Blocks.java
index 7e825d8968..3a9084657c 100644
--- a/core/src/mindustry/content/Blocks.java
+++ b/core/src/mindustry/content/Blocks.java
@@ -3312,10 +3312,13 @@ public class Blocks{
         //endregion
         //region units - erekir
 
+        //TODO completely unfinished
         tankAssembler = new UnitAssembler("tank-assembler"){{
+            requirements(Category.units, with(Items.graphite, 10));
             size = 3;
             output = UnitTypes.vanquish;
-            requirements = BlockStack.list(Blocks.thoriumWallLarge, 4);
+            droneType = UnitTypes.manifold;
+            requirements = BlockStack.list(Blocks.thoriumWallLarge, 4, Blocks.duct, 2);
         }};
 
         //endregion
diff --git a/core/src/mindustry/content/UnitTypes.java b/core/src/mindustry/content/UnitTypes.java
index 929e6c6496..697e9830d8 100644
--- a/core/src/mindustry/content/UnitTypes.java
+++ b/core/src/mindustry/content/UnitTypes.java
@@ -2691,6 +2691,7 @@ public class UnitTypes{
             itemCapacity = 0;
             commandLimit = 0;
             hidden = true;
+            internal = true;
         }};
 
         manifold = new UnitType("manifold"){{
diff --git a/core/src/mindustry/type/BlockSeq.java b/core/src/mindustry/type/BlockSeq.java
new file mode 100644
index 0000000000..e5fc203b6e
--- /dev/null
+++ b/core/src/mindustry/type/BlockSeq.java
@@ -0,0 +1,65 @@
+package mindustry.type;
+
+import arc.struct.*;
+import arc.util.io.*;
+import mindustry.*;
+import mindustry.world.*;
+
+public class BlockSeq{
+    private ObjectIntMap<Block> blocks = new ObjectIntMap<>();
+
+    public void add(Block block){
+        blocks.increment(block);
+    }
+
+    public void add(Block block, int amount){
+        blocks.increment(block, amount);
+    }
+
+    public void remove(Block block){
+        add(block, -1);
+    }
+
+    public void remove(Block block, int amount){
+        add(block, -amount);
+    }
+
+    public void remove(Seq<BlockStack> stacks){
+        stacks.each(b -> remove(b.block, b.amount));
+    }
+
+    public void clear(){
+        blocks.clear();
+    }
+
+    public int get(Block block){
+        return blocks.get(block);
+    }
+
+    public boolean contains(Seq<BlockStack> stacks){
+        return !stacks.contains(b -> get(b.block) < b.amount);
+    }
+
+    public boolean contains(Block block, int amount){
+        return get(block) >= amount;
+    }
+
+    public boolean contains(BlockStack stack){
+        return get(stack.block) >= stack.amount;
+    }
+
+    public void write(Writes write){
+        write.s(blocks.size);
+        for(var entry : blocks.entries()){
+            write.s(entry.key.id);
+            write.i(entry.value);
+        }
+    }
+
+    public void read(Reads read){
+        short amount = read.s();
+        for(int i = 0; i < amount; i++){
+            blocks.put(Vars.content.block(read.s()), read.i());
+        }
+    }
+}
diff --git a/core/src/mindustry/type/UnitType.java b/core/src/mindustry/type/UnitType.java
index f344fadcec..1629be8746 100644
--- a/core/src/mindustry/type/UnitType.java
+++ b/core/src/mindustry/type/UnitType.java
@@ -156,6 +156,7 @@ public class UnitType extends UnlockableContent{
     public boolean singleTarget = false;
     public boolean forceMultiTarget = false;
     public boolean hidden = false;
+    public boolean internal = false;
 
     //for crawlers
     public int segments = 0;
diff --git a/core/src/mindustry/ui/ItemImage.java b/core/src/mindustry/ui/ItemImage.java
index e0a4ce0b17..e80b8804a5 100644
--- a/core/src/mindustry/ui/ItemImage.java
+++ b/core/src/mindustry/ui/ItemImage.java
@@ -44,4 +44,8 @@ public class ItemImage extends Stack{
             }));
         }
     }
+
+    public ItemImage(BlockStack stack){
+        this(stack.block.uiIcon, stack.amount);
+    }
 }
diff --git a/core/src/mindustry/world/blocks/defense/BuildTurret.java b/core/src/mindustry/world/blocks/defense/BuildTurret.java
index 53a208df74..aaa1425a97 100644
--- a/core/src/mindustry/world/blocks/defense/BuildTurret.java
+++ b/core/src/mindustry/world/blocks/defense/BuildTurret.java
@@ -47,6 +47,7 @@ public class BuildTurret extends BaseTurret{
         //this is super hacky, but since blocks are initialized before units it does not run into init/concurrent modification issues
         unitType = new UnitType("turret-unit-" + name){{
             hidden = true;
+            internal = true;
             speed = 0f;
             hitSize = 0f;
             health = 1;
diff --git a/core/src/mindustry/world/blocks/distribution/Duct.java b/core/src/mindustry/world/blocks/distribution/Duct.java
index cf023c2cc2..229a717fb6 100644
--- a/core/src/mindustry/world/blocks/distribution/Duct.java
+++ b/core/src/mindustry/world/blocks/distribution/Duct.java
@@ -124,6 +124,11 @@ public class Duct extends Block implements Autotiler{
             Draw.reset();
         }
 
+        @Override
+        public void payloadDraw(){
+            Draw.rect(fullIcon, x, y);
+        }
+
         protected void drawAt(float x, float y, int bits, float rotation, SliceMode slice){
             Draw.z(Layer.blockUnder);
             Draw.rect(sliced(botRegions[bits], slice), x, y, rotation);
diff --git a/core/src/mindustry/world/blocks/units/UnitAssembler.java b/core/src/mindustry/world/blocks/units/UnitAssembler.java
index 5617930bda..4cc31aac30 100644
--- a/core/src/mindustry/world/blocks/units/UnitAssembler.java
+++ b/core/src/mindustry/world/blocks/units/UnitAssembler.java
@@ -1,14 +1,21 @@
 package mindustry.world.blocks.units;
 
+import arc.*;
+import arc.graphics.g2d.*;
+import arc.math.*;
 import arc.math.geom.*;
 import arc.struct.*;
 import arc.util.*;
 import arc.util.io.*;
 import mindustry.content.*;
+import mindustry.entities.*;
+import mindustry.entities.units.*;
 import mindustry.gen.*;
 import mindustry.graphics.*;
 import mindustry.type.*;
+import mindustry.ui.*;
 import mindustry.world.blocks.payloads.*;
+import mindustry.world.consumers.*;
 
 import static mindustry.Vars.*;
 
@@ -20,13 +27,13 @@ import static mindustry.Vars.*;
  * 3.
  * */
 public class UnitAssembler extends PayloadBlock{
-    public int areaSize = 10;
+    public int areaSize = 11;
     public UnitType droneType;
     public int dronesCreated = 4;
 
     //TODO should be different for every tier.
     public Seq<BlockStack> requirements = new Seq<>();
-    public UnitType output = UnitTypes.vanquish;
+    public UnitType output;
 
     public UnitAssembler(String name){
         super(name);
@@ -48,21 +55,62 @@ public class UnitAssembler extends PayloadBlock{
         Tmp.r1.x += Geometry.d4x(rotation) * len;
         Tmp.r1.y += Geometry.d4y(rotation) * len;
 
-        //TODO better visuals here?
+        //TODO better visuals here? dashLine looks bad
         Drawf.dashRect(valid ? Pal.accent : Pal.remove, Tmp.r1);
     }
 
+    @Override
+    public void setBars(){
+        super.setBars();
+
+        //TODO progress bar
+        //bars.add("progress", (UnitAssemblerBuild e) -> new Bar("bar.progress", Pal.ammo, e::fraction));
+
+        bars.add("units", (UnitAssemblerBuild e) ->
+            new Bar(() ->
+            Core.bundle.format("bar.unitcap",
+                Fonts.getUnicodeStr(output.name),
+                e.team.data().countType(output),
+                Units.getStringCap(e.team)
+            ),
+            () -> Pal.power,
+            () -> (float)e.team.data().countType(output) / Units.getCap(e.team)
+        ));
+    }
+
+    @Override
+    public void drawRequestRegion(BuildPlan plan, Eachable<BuildPlan> list){
+        Draw.rect(region, plan.drawx(), plan.drawy());
+        //Draw.rect(outRegion, plan.drawx(), plan.drawy(), plan.rotation * 90);
+        Draw.rect(topRegion, plan.drawx(), plan.drawy());
+    }
+
+    @Override
+    public void init(){
+        consumes.add(new ConsumePayloads(requirements, (UnitAssemblerBuild build) -> build.blocks));
+
+        super.init();
+    }
+
     public class UnitAssemblerBuild extends PayloadBlockBuild<BuildPayload>{
         public Seq<Unit> units = new Seq<>();
+        public BlockSeq blocks = new BlockSeq();
 
-        //TODO how should payloads be stored? counts of blocks? intmap? references?
-        //public Seq<BuildPayload> payloads = new Seq<>();
+        //TODO progress
+        //TODO how should payloads be stored exactly? counts of blocks? intmap? references?
+
+        public Vec2 getUnitSpawn(){
+            float len = tilesize * (areaSize + size)/2f;
+            float unitX = x + Geometry.d4x(rotation) * len, unitY = y + Geometry.d4y(rotation) * len;
+            return Tmp.v4.set(unitX, unitY);
+        }
 
         @Override
         public void updateTile(){
             units.removeAll(u -> !u.isAdded() || u.dead);
 
-            if(consValid() && units.size < dronesCreated){
+            //units annoying, disabled for now
+            if(false && efficiency() > 0 && units.size < dronesCreated){
                 //TODO build animation? distribute spawning?
                 var unit = droneType.create(team);
                 if(unit instanceof BuildingTetherc bt){
@@ -76,29 +124,88 @@ public class UnitAssembler extends PayloadBlock{
                 units.add(unit);
             }
 
+            //TODO units should move stuff into position
+
+            //TODO check if area is occupied
+
+            Vec2 spawn = getUnitSpawn();
+
+            //check if all requirements are met
+            if(consValid() & Units.canCreate(team, output)){
+
+                //TODO ???? should this even be part of a trigger
+                consume();
+
+                //TODO actually just goes poof
+                var unit = output.create(team);
+                unit.set(spawn.x + Mathf.range(0.001f), spawn.y + Mathf.range(0.001f));
+                unit.rotation = 90f;
+                unit.add();
+
+                Fx.spawn.at(unit);
+
+                blocks.clear();
+            }
+
             //TODO drones need to indicate that they are in position and actually play an animation
         }
 
+        @Override
+        public void draw(){
+            Draw.rect(region, x, y);
+            //Draw.rect(outRegion, x, y, rotdeg());
+
+            Draw.z(Layer.blockOver);
+
+            //payRotation = rotdeg();
+            //drawPayload();
+
+            Draw.z(Layer.blockOver + 0.1f);
+
+            Draw.rect(topRegion, x, y);
+
+            Vec2 spawn = getUnitSpawn();
+
+            //TODO which layer?
+            Draw.z(Layer.power - 1f);
+
+            Draw.mixcol(Pal.accent, 1f);
+            Draw.alpha(0.4f + Mathf.absin(10f, 0.2f));
+            Draw.rect(output.fullIcon, spawn.x, spawn.y);
+            Draw.reset();
+        }
+
         @Override
         public void handlePayload(Building source, Payload payload){
             //super.handlePayload(source, payload);
 
+            blocks.add(((BuildPayload)payload).block());
+
             //payloads.add((BuildPayload)payload);
         }
 
         @Override
         public boolean acceptPayload(Building source, Payload payload){
-            return payload instanceof BuildPayload bp && requirements.contains(b -> b.block == bp.block());
+            return payload instanceof BuildPayload bp && requirements.contains(b -> b.block == bp.block() && blocks.get(bp.block()) < b.amount);
         }
 
         @Override
         public void write(Writes write){
             super.write(write);
+
+            //blocks.write(write);
+
+            //TODO save:
+            //- unit IDs
+            //- progress
+            //- payloads in position (should they have positions?)
         }
 
         @Override
         public void read(Reads read, byte revision){
             super.read(read, revision);
+
+            //blocks.read(read);
         }
     }
 }
diff --git a/core/src/mindustry/world/consumers/ConsumeItems.java b/core/src/mindustry/world/consumers/ConsumeItems.java
index 90f1c4fd85..fb1e6a7b45 100644
--- a/core/src/mindustry/world/consumers/ConsumeItems.java
+++ b/core/src/mindustry/world/consumers/ConsumeItems.java
@@ -37,7 +37,7 @@ public class ConsumeItems extends Consume{
             int i = 0;
             for(var stack : items){
                 c.add(new ReqImage(new ItemImage(stack.item.uiIcon, stack.amount),
-                () -> build.items != null && build.items.has(stack.item, stack.amount))).padRight(8);
+                () -> build.items.has(stack.item, stack.amount))).padRight(8);
                 if(++i % 4 == 0) c.row();
             }
         }).left();
diff --git a/core/src/mindustry/world/consumers/ConsumePayloads.java b/core/src/mindustry/world/consumers/ConsumePayloads.java
new file mode 100644
index 0000000000..b45cfae90a
--- /dev/null
+++ b/core/src/mindustry/world/consumers/ConsumePayloads.java
@@ -0,0 +1,62 @@
+package mindustry.world.consumers;
+
+import arc.func.*;
+import arc.scene.ui.layout.*;
+import arc.struct.*;
+import mindustry.gen.*;
+import mindustry.type.*;
+import mindustry.ui.*;
+import mindustry.world.meta.*;
+
+public class ConsumePayloads extends Consume{
+    //TODO bad, should be part of Building + dynamic
+    protected Func<Building, BlockSeq> inventory;
+
+    public Seq<BlockStack> payloads;
+
+    public <T extends Building> ConsumePayloads(Seq<BlockStack> payloads, Func<T, BlockSeq> inventory){
+        this.payloads = payloads;
+        this.inventory = (Func<Building, BlockSeq>)inventory;
+    }
+
+    @Override
+    public boolean valid(Building build){
+        return inventory.get(build).contains(payloads);
+    }
+
+    @Override
+    public void trigger(Building build){
+        inventory.get(build).remove(payloads);
+    }
+
+    @Override
+    public void display(Stats stats){
+        //TODO
+
+        for(var stack : payloads){
+            stats.add(Stat.input, t -> {
+                t.add(new ItemImage(stack));
+                t.add(stack.block.localizedName).padLeft(4).padRight(4);
+            });
+        }
+    }
+
+    @Override
+    public void build(Building build, Table table){
+        var inv = inventory.get(build);
+
+        table.table(c -> {
+            int i = 0;
+            for(var stack : payloads){
+                c.add(new ReqImage(new ItemImage(stack.block.uiIcon, stack.amount),
+                () -> inv.contains(stack.block, stack.amount))).padRight(8);
+                if(++i % 4 == 0) c.row();
+            }
+        }).left();
+    }
+
+    @Override
+    public ConsumeType type(){
+        return ConsumeType.payload;
+    }
+}
diff --git a/core/src/mindustry/world/consumers/ConsumeType.java b/core/src/mindustry/world/consumers/ConsumeType.java
index 9a68a050cc..d6cd64a735 100644
--- a/core/src/mindustry/world/consumers/ConsumeType.java
+++ b/core/src/mindustry/world/consumers/ConsumeType.java
@@ -3,5 +3,6 @@ package mindustry.world.consumers;
 public enum ConsumeType{
     item,
     power,
-    liquid
+    liquid,
+    payload
 }
diff --git a/tools/src/mindustry/tools/Generators.java b/tools/src/mindustry/tools/Generators.java
index 544b747f02..13acaba85f 100644
--- a/tools/src/mindustry/tools/Generators.java
+++ b/tools/src/mindustry/tools/Generators.java
@@ -486,7 +486,7 @@ public class Generators{
         });
 
         generate("unit-icons", () -> content.units().each(type -> {
-            if(type.isHidden()) return; //hidden units don't generate
+            if(type.internal) return; //internal hidden units don't generate
 
             ObjectSet<String> outlined = new ObjectSet<>();