I'm in Cape May NJ, the southern tip of the state a few miles from the Atlantic. While the weather is moderate compared to our neighbors just to the north in Pa., it's still the northeast and during the winter, finishing outdoors is not an option.
We had our home on the market last year, as you can see I'm still here so moving isn't an option...besides we were headed to Pa. so finishing outdoors would have been even less of an option.
Al, what you have is pretty much what I have in mind. The fan exhaust at the outer wall is one thing that I wonder about. Something like you describe to keep out the cold and flying interlopers but easy to keep clean of lacquer, etc buildup. The use of water based finishes answers a way to avoid the expense of explosion/fire proof electrical devices but those type finishes won't be used all of the time. I won't be spraying huge amounts of lacquer, etc so I wonder just what the threshold is for fire hazard? If the exhaust fan is started prior to spraying so there's no buildup, will that answer?
Yes, I'll be using a "lazy susan" device. Also a threaded M33 stud that fits my faceplates and chucks mounted to hold work in position for spraying. I made a devise such as this for carving, using the stud, black pipe and an eyebolt, total about $25, much cheaper than the $150+ in the catalogs and does the same thing.
Ruth, a coppersmith friend has a shopbuilt spraybooth as you describe, made of plywood. No exhaust but the booth is in a large shop near a big overhead door. He sprays with the booth door open of course, and once the fumes dissipate he closes the booth doors. There's a lighbulb in the booth for warmth and drying after the fumes are gone. Several decades with no fire. Yes, an option.
Mike