I guess if the ground regularly froze, you could get the same effect from the floor.
Are the GS buildings actual "portables"? If so they should warm up faster inside when spring comes.
No, they’re wooden-frame buildings, I think octagonal, on elevated decks. Probably wouldn’t be too hard to move one, but they’re not mobile units in the usual sense.
We rarely get long-term below-freezing temperatures here, so the foundations freezing isn’t a real issue.