Absolutely nothing.......dont know why some folks have to post dumb $hit like that. This may be of interest to you
https://www.painttalk.com/threads/pop-up-paint-booth.98111/
Because this is a guy that fought tooth and nail over paying the price for a quality 3/4" drive torque wrench. I'm equally amused why people think that a pair of window fans is going to satisfactorily exhaust the cloud of overspray that's going to be generated by automotive painting. Where I live, Phoenix, AZ we have low winds, very few bugs and mild to hot temperatures. Better to paint outside under an open sided car port, which I've done with considerable success, than to use one of these blow up doll paint booths. Check recent videos from Paint Society where using one of these was a complete fail, it self deflated while the paint was still wet, and Kandyman where he used one to paint an oversized truck and hated every minute of it.
You want the best advice? Well here goes from somebody who has himself access to a Garmat.
1) Paint it outside in an open sided car port
2) Pay the price ($1500-$2000) for a good (at least five stage) turbine paint sprayer. Fuji and Apollo make good ones. You get a spray gun and turbine that should last a lifetime and you don't need to buy a big compressor as it's part of the turbine package. The overspray will be 1/5th of that which you'll get with a SATA X5500, DeVilbiss DV1 or Iwata SuperNova top of the line professional gun. Since Sumboodie will likely be using a Harbor Freight $20 purple gun, and likely a nail gun compressor, it will be even worse.
3) Call all of the local bodyshops and see if they are willing to rent out their spray booth for the weekend. Without a doubt the best and cheapest way if possible.