cool Thats similar to what I did I used 1 stall of my 2 car detatched and dropped plastic on all 4 sides and used a 2x4 to hold it on the bottom and stapled plastic to the ceiling also.
I've been studying up on building just such a paint booth.
I've already set my posts to extend my shop (currently 24x32, another 24x24) to accomadate a paint booth. I may build the exhaust fan and filter so they exit through the back wall of the shop. Will try to get some Pics of the progress. To cold right now. JTS 71 Mach1