Back in the late 60s I worked at one of the nuclear weapons plants in Oak Ridge, TN. Working in the lab, I spent my fair share of time working in a glove box. If you're not familiar with it, it's a closed environment where you can work on all sorts of nasty materials without contaminating the surrounding area or yourself. Your arms fit into rubber gloves that are attached and sealed. Here's something from Wiki:
I'm thinking, why can't the same theory work for an enclosed spray booth. I've drawn up some plans and I've got a couple of questions. Should it be a down draft, up draft, side draft or back draft? I wonder how much flow I'll need to keep the paint overspray from building up and obscuring vision?