Stair D level-four/five opening correspondence · unresolved
Research representation: none. Architectural checks: pending.
Fourth floor · Fifth floor
Source-space comparison only; no accepted world insertion or slab-opening geometry.
Source relationships · not a verified physical connection
- diagnoses placement of (traced, unreviewed): f4 stair d
1 recorded properties
Still to extract or check- classified W-6 slab edge
- corresponding fifth-floor source edge
- clear opening dimensions
- stair-to-slab structural interface