diff --git a/core/src/mindustry/type/UnitType.java b/core/src/mindustry/type/UnitType.java
index 2e28d01ff1..93f73fb49d 100644
--- a/core/src/mindustry/type/UnitType.java
+++ b/core/src/mindustry/type/UnitType.java
@@ -127,7 +127,7 @@ public class UnitType extends UnlockableContent{
         softShadowRegion, jointRegion, footRegion, legBaseRegion, baseJointRegion, outlineRegion;
     public TextureRegion[] wreckRegions;
 
-    protected float maxBuildTime = -1f;
+    protected float buildTime = -1f;
     protected @Nullable ItemStack[] cachedRequirements;
     protected @Nullable ItemStack[] totalRequirements;
 
@@ -462,10 +462,10 @@ public class UnitType extends UnlockableContent{
         }
     }
 
-    /** @return the time required to build this unit, as a maximum value that takes into account reconstructors */
+    /** @return the time required to build this unit, as a value that takes into account reconstructors */
     public float getBuildTime(){
         getTotalRequirements();
-        return maxBuildTime;
+        return buildTime;
     }
 
     /** @return all items needed to build this unit, including reconstructor steps. */
@@ -479,16 +479,18 @@ public class UnitType extends UnlockableContent{
             totalRequirements = ItemStack.empty;
 
             if(result != null){
-                maxBuildTime = timeret[0];
                 ItemSeq total = new ItemSeq();
 
                 total.add(result);
                 if(ret[0] != null){
                     total.add(ret[0].getTotalRequirements());
-                    maxBuildTime = Math.max(ret[0].maxBuildTime, maxBuildTime);
                 }
                 totalRequirements = total.toArray();
             }
+
+            for(var stack : totalRequirements){
+                buildTime += stack.item.cost * stack.amount;
+            }
         }
         return totalRequirements;
     }
diff --git a/core/src/mindustry/world/blocks/payloads/PayloadDeconstructor.java b/core/src/mindustry/world/blocks/payloads/PayloadDeconstructor.java
index 5619506f37..e7bbfba6c1 100644
--- a/core/src/mindustry/world/blocks/payloads/PayloadDeconstructor.java
+++ b/core/src/mindustry/world/blocks/payloads/PayloadDeconstructor.java
@@ -7,9 +7,12 @@ import arc.util.io.*;
 import mindustry.*;
 import mindustry.gen.*;
 import mindustry.graphics.*;
+import mindustry.ui.*;
 
 public class PayloadDeconstructor extends PayloadBlock{
-    public float deconstructSpeed = 2f;
+    public float maxPayloadSize = 4;
+    public float deconstructSpeed = 2.5f;
+    public int dumpRate = 4;
 
     public PayloadDeconstructor(String name){
         super(name);
@@ -32,6 +35,13 @@ public class PayloadDeconstructor extends PayloadBlock{
         return new TextureRegion[]{region, topRegion};
     }
 
+    @Override
+    public void setBars(){
+        super.setBars();
+
+        bars.add("progress", (PayloadDeconstructorBuild e) -> new Bar("bar.progress", Pal.ammo, () -> e.progress));
+    }
+
     public class PayloadDeconstructorBuild extends PayloadBlockBuild<Payload>{
         public @Nullable Payload deconstructing;
         public @Nullable float[] accum;
@@ -58,6 +68,7 @@ public class PayloadDeconstructor extends PayloadBlock{
                 //deconstructing.draw();
 
                 //TODO shadow
+                //TODO looks really bad
                 Draw.draw(Layer.blockOver, () -> {
                     Drawf.construct(x, y, deconstructing.icon(), Pal.remove, 0f, 1f - progress, speedScl, time);
                     Draw.color(Pal.remove);
@@ -80,13 +91,20 @@ public class PayloadDeconstructor extends PayloadBlock{
 
         @Override
         public boolean acceptPayload(Building source, Payload payload){
-            return deconstructing == null && super.acceptPayload(source, payload) && payload.requirements().length > 0;
+            return deconstructing == null && super.acceptPayload(source, payload) && payload.requirements().length > 0 && payload.fits(maxPayloadSize);
         }
 
         @Override
         public void updateTile(){
-            //always dump items
-            dumpAccumulate();
+            if(items.total() > 0){
+                for(int i = 0; i < dumpRate; i++){
+                    dumpAccumulate();
+                }
+            }
+
+            if(deconstructing == null){
+                progress = 0f;
+            }
 
             if(deconstructing != null){
                 var reqs = deconstructing.requirements();