There are plenty of buildings that failed through fire or structural design faults. Very few will have had such detailed architectural records made of them. Steel beams, ties and other components subject to the temperatures of blazing wood fires can lose an appreciable amount of strength. Reusing the shell may seem a good idea but the stones need detailed inspection for cracks and the mortar may need replacing. The steel must be suspect. Whether the shell is retained or not, the interior needs a total rethink. An up to date structure and firesafe interior seems more sensible. They can build a homage to Mackintosh rather than put the same fire hazards back in it. A VR room could guide folk through a virtual copy of the old building.
Discussed on radio Scotland this morning that this time even the foundations have been fire damaged.