|Suspended spray booth|
Net result, the square can be folded up against the wall. This is a bit of a reach, so we fastened a couple of eyes waaay up the wall, put cords through them, and tied one end to each of the "free" corners of the square. By anchoring the other end to handy screws in thew wall, we can lower the square until it is horizontal and tie it off.
A few polythene drop-sheets were then secured to the square frame with clear packing tape, like a shower curtain. One split left for the entrance, of course! A diagonal piece of pipe held across the square with cable ties gives a handy thing to dangle spray victims from on long wire hooks.
The floor underneath is protected by an old duvet cover. Some 2x4 offcuts strategically placed around the edges of the drop-sheets stop them from billowing up when the spray gun is used. Seems to work just fine!