In 15mm, its a tiny build, and if in scale, unsuitable for interior play.
60mm wide is too tiny for a based 15mm fig, especially in the halls and smaller rooms.
Would have to be a 3/4" grid floorplan, like 6" wide, or 48 feet wide instead of the correct 24 feet.
Thats the catch. Correct scale, with no interior play, or a mock up, that looks right, but much bigger.