I made a booth within my shop once by making a 16 by 20 frame out of electrical conduit, covered it with clear plastic, and hung it from the ceiling of my shop. I then got a roll of clear plastic and attached it to the frame and let it drop to the floor and create the sides. The sides were one continious piece except where the ends came together and that became my door. I cut holes in each end and put a space heater in one end that had to blow through some furnace filters and some fans in the other. It worked pretty good. Painted two cars in there. I have sinse made a perminent booth next to my shop
Hope this helps
Dan