You have a warehouse, so let's say 1000 square feet, Id park the car in the dead center to paint and get as clean of a job as any $200,000 downdraft paint booth.
Size of area equals clean and the inflatable ones are just too small and most have a static problem when the air is going through.
5-7k or 10k? Shoooot...haven't priced 2x4's sheetrock & white paint lately but inflatible wouldn't be my choice.
If you can rent corner, 2 walls are up already. DIY air system. Depends on owner i suppose.
He'd have a nice enclosed section when u leave.
Back when I started, I sprayed in an old dirt floor welding shop. I would wet the floor down well, let everything settle, and shoot. Most times I used lacquer for small repairs, but I also did completes with enamel. The big open wet area seemed to attract dust. I’m still amazed at the quality achieved in such an environment.