i started off in that shop with 6 or so hondas crammed between a boat, a VW squareback "arts car," and a pile of my landlord's other crap in about 100 sq. feet. now, 2 years later, i share the entire 1400 sq. ft. with 7 other friends---most of whom are members on here (mr. blasty, southbound, billdramp, whodareswins, and toddthreat)---and have shared welding equipment, blasting cabinet, grinder/buffer, parts washer, etc. i'm pretty lucky. oh yeah, and the rent is $200.
kghost--the main thing i like about the expandable foam, is that the base can be formed right around the frame or whatever else you are working around. also, if you shave too much, you just add more and wait for it to set up. i tried 2" rigid foam glued together at first, but it was too much of a pain getting the underside cut out to fit the frame.