note: Transverse N-S building section cut at canon X = 12.0 ft (through the Shower Room / Changeroom column on the west side of the building), viewed from the east looking west (left = south, right = north). Shows: 1.5 ft concrete float pontoon slab cross-section with 6" lips, full 15 ft triangular gable (eaves at 12 ft, ridge at 15 ft, peak at canon Y=10), three walls intersected by the cut plane (S-perim 12" T_EXT, Y8-CRSR 6" T_INT6, N-perim-RCR 12" T_EXT) drawn at canon thickness with A1 wall-fill colour palette, room labels for SHOWER ROOM and CHANGEROOM along the floor line with their clear N-S spans, horizontal dim chain (wall-to-wall 20'-0" + slab 21'-0"), and vertical dim chain (slab / wall / rise / ridge). Render-x axis represents canon-Y; all dimensions imported from src/floatsauna/canon.py.
