Owner confirmed the long-wheelbase 12.8 m Axer. Pin it in the vehicle
sheet with the matching PTAC order of magnitude (~19 t, ad-grade,
official value still to be read on the plate), and bump the FreeCAD
interior-length placeholder from a 12 m guess to 12300 mm so the
parametric zoning reflects the right envelope until the real survey.
Third leg of the CAD tooling: FreeCAD 1.1 for 3D and dimensioned
technical drawings. Seed a spreadsheet-driven model of the interior
(envelope, 9-seat zone, shower cell, Tiroclass bench, fab-machine
zone) so the survey of the emptied bus only has to fill in the
dimension sheet to recalibrate the whole layout. Conventions and
planned files documented in the folder README; decision registered.