Plan the overhead crane, maintenance workshop and visitor corridor

New docs/crane-workshop-tours.md: a 5 t single-girder EOT crane over the
whole production compartment (stops at the warehouse fire wall), a
machine door and crane-served workshop/machine bay at the ramp end, and
a glazed ground-level visitor corridor along the car-park elevation with
stations in process order, its own air and acoustic glazing so tours
need no PPE. Covers what each changes in the shell (crane-ready frame,
hook height under the 7.0 m eave, no full-height cross walls in the
crane zone, room lids and crane hatches), safety, costs and open
decisions.

Propagated: construction RFQ (crane-ready frame, new section 1c, machine
door, accessible 1:12 entrance now required), scale zone table (+210 to
280 m2, total ~1,400 to 2,000 m2), facility security, worker safety,
roadmap items 9 and 15, total investment added-scope table, README.

docs/finance/total-investment.md

@@ -33,6 +33,19 @@ July 2026; the underlying THB estimates are unchanged, because EUR/THB at
 | Contingency 15% | ~0.6M – 1.2M | ~20M – 38M | |
 | **Total, full vision** | **~4.7M – 8.9M USD** | **~155M – 294M THB** | |
 
+### Added scope, not yet in the roll-up
+
+Decided after the roll-up above was compiled; carried here as estimates
+until the next re-base folds them into the blocks (the building and
+software lines, and the contingency on top).
+
+| Block | USD | THB | Basis |
+|---|---|---|---|
+| Overhead crane, runway, frame premium, machine door | 97k – 227k | 3.2M – 7.5M | estimate, [crane, workshop and tours](../crane-workshop-tours.md) |
+| Maintenance workshop and machine bay fit-out | 30k – 76k | 1.0M – 2.5M | estimate, same |
+| Visitor corridor and accessible entrance | 67k – 148k | 2.2M – 4.9M | estimate, same |
+| **Added so far** | **~195k – 450k** | **~6.4M – 14.9M** | about 5 to 6% on the full-vision subtotal |
+
 ## Phased entry
 
 A credible launch phase is far smaller, roughly **1.7M to 2.9M USD