Cos the time limitation gives a basis for doing a cracked version of it. Might be worth chaos doing a few sample scenes - an exterior, interior and product shot that fits within the limitations to give people something real world to try out?
Attach them all into huge multi subs and edit polys.
You cant edit the model much, or use it for production, but surely thats the point of a demo. I’ve been able to demo some of our biggest 3k object + scenes to my boss perfectly well, just takes a little prep before starting it up.