I made mine out of (believe it or not) cardboard.
I do 1:1 body work as well, I got a hood box (4ftx4ft. 2 sides but it folds around the hood like a book.) stretched it out flat, made some measurements, scored through 1 layer of paper(fold relief). then I built a 2x4 base and wrapped the base with the cardboard and screwed slats around the perimeter on 3 sides. Then i cut the doors so they overlap a few inches. On the top I used a stove hood. the base is the same size. I bought a squirrel cage setup and vented it through a basement window using a dryer vent and duct.
I have a furnace filter in the base to filter air into the booth and a furnace filter up top to filter the paint out of the vents. this also helps in keeping the fan clean. In the top i mounted a 24in fluro and on the sides halfway up I mounted 4 cfl bulbs(2 per side). I use a childproof slide lock the secure the doors from my 3yr old son.