diff --git a/README.md b/README.md
index ec807fc..6cf8ea8 100644
--- a/README.md
+++ b/README.md
@@ -111,6 +111,11 @@ The detail lives in dedicated documents:
   end, and a glazed ground-level corridor for guided tours without noise,
   dust or plating chemistry; what each changes in the building and what
   it costs
+- [Production hall layout sketch](docs/production-hall-layout-sketch.png):
+  a rough BIM sketch in FreeCAD (`docs/production-hall-layout-sketch.FCStd`)
+  of the 60 x 25 m phase 1 hall: zones in process order along the visitor
+  corridor, the crane zone, room-in-room boxes and the main equipment; every
+  position is an estimate
 - [Process logging and traceability](docs/traceability.md): end-to-end
   per-order traceability for customers, batch genealogy from audio file to
   shipment, and the requirements this sets for the factory software
@@ -211,6 +216,8 @@ docs/
 ├── payap-partnership.md   Joint student programmes with Payap University
 ├── plant-operation.html   Animated plant overview (simulated SCADA)
 ├── process-flow.md        Audio file to delivered record, with all checks
+├── production-hall-layout-sketch.FCStd  Rough BIM layout sketch of the hall
+├── production-hall-layout-sketch.png    Top view of the sketch
 ├── production-timeline.md Order turnaround, stage by stage
 ├── project-timeline.md    Calendar to first paying release, critical path
 ├── quality-automation.md  Stamper metrology and layered record QC
diff --git a/docs/crane-workshop-tours.md b/docs/crane-workshop-tours.md
index ee0e4ef..f329110 100644
--- a/docs/crane-workshop-tours.md
+++ b/docs/crane-workshop-tours.md
@@ -285,6 +285,18 @@ window or not at all. The concept drawing
 and the detached utility yard and does not yet follow this order; it
 needs redrawing at the next layout pass.
 
+A first rough pass that does follow it is the BIM sketch
+[production-hall-layout-sketch.FCStd](production-hall-layout-sketch.FCStd)
+(top view: [PNG](production-hall-layout-sketch.png), October 2026): ramp
+end with machine door, workshop and spares; then mastering, galvanics,
+stamper prep, PVC lab and material area, the press hall, inspection, QC
+and packaging along the corridor; the fire wall at 48 m and the warehouse
+and dispatch at the dock end, with a 4.5 m crane and forklift aisle along
+the back wall from the machine door to the fire wall. It shows one
+conflict to resolve: with the workshop at the ramp end, reception and the
+cutting room sit under the bridge's travel too, against point 6 above
+(cutting room outside the crane zone).
+
 ### How it is built
 
 - **Room-in-room**: a glazed wall on the production side, a solid roof at
diff --git a/docs/production-hall-layout-sketch.FCStd b/docs/production-hall-layout-sketch.FCStd
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