now, I may be utterly wrong with this, but for 1/32 scale, wouldn't you divide by 32?...if so, you're looking at roughly 4.7'x3.1'...at that point, I'm not sure if it would be better to use thick slabs of blue/pink/XPS foam, or start building
MDF boxes or something as a base structure...either way, that sounds like it would be massively impressive, and cool to play on, but oh man, a lot of work! - a bit too ambitious for my liking!