Check out my photo album for pics of my homemade booth made on a 10X20 frame. Roll plastic works OK for one vehicle but the overspray will flake off and become a major problem. I would make a wood frame and staple the plastic to the inside using duct tape for the seams and replace it after each paint job. Hang your light fixtures on hooks makes them easy to take down. Use daylight tubes , not the cool white tubes in the fixtures. You will need to clean the light fixtures periodically because the overspray is attracted to them for some reason. The plastic sold for masking by your body shop supplier is made for this purpose and the paint will stick just like it will on masking paper. Been there and done that, trying to go cheap.