diff --git a/Aetheria.State.Verify/Program.cs b/Aetheria.State.Verify/Program.cs
index aef1da365..a9e115035 100644
--- a/Aetheria.State.Verify/Program.cs
+++ b/Aetheria.State.Verify/Program.cs
@@ -5227,8 +5227,9 @@ static void RequireInventoryCargoItemDetailsUseEveSurface(string root)
         "HandleCargoItemDetailsSurfaceCommand(",
         "AetheriaEveUnitySurfaceHost.RenderRuntime(",
         "AetheriaEveUnitySurfaceHost.Hide(_cargoItemDetailsSurfaceDocument)",
-        "AetheriaRuntimeCargoItemDetailsSurfaceBuilder.Build(ComposeCargoItemDetailsSurface(",
-        "AetheriaRuntimeCargoItemDetailsSurfaceBuilder.Compose(",
+        "AetheriaRuntimeCargoItemDetailsSurfaceBuilder.Build(",
+        "ResolveManufacturerName(typedItem)",
+        "FormatItemTier(typedItem, equippableItem)",
         "ComposeCargoItemObservation(",
         "AetheriaRuntimeCargoItemDetailsSurfaceCommands.TryRead(request, out var command)",
         "AetheriaRuntimeCargoItemDetailsCommandKind.Close"
@@ -5319,6 +5320,7 @@ static void RequireInventoryCargoItemDetailsUseEveSurface(string root)
         "host.AddComponent<UIDocument>",
         "string.Equals(request.Command, AetheriaRuntimeCargoItemDetailsSurfaceBuilder.Close",
         "new AetheriaRuntimeCargoItemDetailsSurfaceState(",
+        "ComposeCargoItemDetailsSurface(",
         "ProjectCargoItemDetailsSurfaceState(",
         "ProjectCargoItemBehaviorSections(",
         "ProjectCargoItemBehaviorMetric(",
@@ -5349,7 +5351,7 @@ static void RequireInventoryCargoItemDetailsUseEveSurface(string root)
         "AetheriaRuntimeCargoItemObservation",
         "AetheriaRuntimeCargoItemSection",
         "AetheriaRuntimeCargoItemMetric",
-        "public static AetheriaRuntimeCargoItemDetailsSurfaceState Compose(",
+        "private static AetheriaRuntimeCargoItemDetailsSurfaceState ComposeState(",
         "ProjectBehaviorSections(",
         "ProjectBehaviorMetric(",
         "public static AetheriaRuntimeSurfaceDocument Build("
@@ -5363,6 +5365,13 @@ static void RequireInventoryCargoItemDetailsUseEveSurface(string root)
             "Shared cargo-item detail surface builder no longer owns the cargo inspection contract: " +
             string.Join(", ", missingBuilderSymbols));
     }
+
+    if (cargoItemSurfaceBuilder.Contains("public static AetheriaRuntimeCargoItemDetailsSurfaceState Compose(", StringComparison.Ordinal) ||
+        cargoItemSurfaceBuilder.Contains("public static AetheriaRuntimeCargoItemDetailsSurfaceState Project(", StringComparison.Ordinal))
+    {
+        throw new InvalidOperationException(
+            "Runtime cargo item detail composition must stay behind Build(...); do not re-expose Compose/Project as the public cargo item details surface path.");
+    }
 }
 
 static void RequireInventoryEquippedItemDetailsUseEveSurface(string root)
diff --git a/Assets/Scripts/UI/Menu/InventoryMenu.cs b/Assets/Scripts/UI/Menu/InventoryMenu.cs
index bec4af86f..9ec66a547 100644
--- a/Assets/Scripts/UI/Menu/InventoryMenu.cs
+++ b/Assets/Scripts/UI/Menu/InventoryMenu.cs
@@ -284,7 +284,13 @@ public class InventoryMenu : MonoBehaviour
             transform,
             _cargoItemDetailsSurfaceDocument,
             "Aetheria Inventory Cargo Item Details Surface",
-            AetheriaRuntimeCargoItemDetailsSurfaceBuilder.Build(ComposeCargoItemDetailsSurface(item, typedItem)),
+            AetheriaRuntimeCargoItemDetailsSurfaceBuilder.Build(
+                typedItem,
+                ComposeCargoItemObservation(item),
+                ResolveManufacturerName(typedItem),
+                item is EquippableItem equippableItem ? FormatItemTier(typedItem, equippableItem) : "",
+                FormatValue,
+                FormatTemperature),
             HandleCargoItemDetailsSurfaceCommand,
             _cargoItemDetailsSurfaceChrome,
             sortingOrder: 1001);
@@ -468,19 +474,6 @@ public class InventoryMenu : MonoBehaviour
                     ("group", groupIndex.ToString(CultureInfo.InvariantCulture)))));
     }
 
-    private AetheriaRuntimeCargoItemDetailsSurfaceState ComposeCargoItemDetailsSurface(
-        ItemInstance item,
-        AetheriaRuntimeCatalogItem typedItem)
-    {
-        return AetheriaRuntimeCargoItemDetailsSurfaceBuilder.Compose(
-            typedItem,
-            ComposeCargoItemObservation(item),
-            ResolveManufacturerName(typedItem),
-            item is EquippableItem equippableItem ? FormatItemTier(typedItem, equippableItem) : "",
-            FormatValue,
-            FormatTemperature);
-    }
-
     private static AetheriaRuntimeCargoItemObservation ComposeCargoItemObservation(ItemInstance item)
     {
         var equippableItem = item as EquippableItem;
diff --git a/Packages/org.gamecult.aetheria.state/Runtime/AetheriaRuntimeCargoItemDetailsSurfaceBuilder.cs b/Packages/org.gamecult.aetheria.state/Runtime/AetheriaRuntimeCargoItemDetailsSurfaceBuilder.cs
index 8e1ce4ce4..9e87bbb9c 100644
--- a/Packages/org.gamecult.aetheria.state/Runtime/AetheriaRuntimeCargoItemDetailsSurfaceBuilder.cs
+++ b/Packages/org.gamecult.aetheria.state/Runtime/AetheriaRuntimeCargoItemDetailsSurfaceBuilder.cs
@@ -118,7 +118,29 @@ namespace GameCult.Aetheria.State.Verse
         public const string SurfaceId = "aetheria.inventory.cargo_item_details";
         public const string Close = "aetheria.inventory.cargo_item_details.close";
 
-        public static AetheriaRuntimeCargoItemDetailsSurfaceState Compose(
+        public static AetheriaRuntimeSurfaceDocument Build(
+            AetheriaRuntimeCatalogItem typedItem,
+            AetheriaRuntimeCargoItemObservation item,
+            string manufacturer,
+            string tier,
+            Func<float, string> formatValue,
+            Func<float, string> formatTemperature,
+            DateTime updatedAtUtc = default(DateTime),
+            long version = 1)
+        {
+            return Build(
+                ComposeState(
+                    typedItem,
+                    item,
+                    manufacturer,
+                    tier,
+                    formatValue,
+                    formatTemperature,
+                    updatedAtUtc),
+                version);
+        }
+
+        private static AetheriaRuntimeCargoItemDetailsSurfaceState ComposeState(
             AetheriaRuntimeCatalogItem typedItem,
             AetheriaRuntimeCargoItemObservation item,
             string manufacturer,