OK, heres the best way I see to do it, first "permanent" is to me a waste, heres what happens, even if you restore cars all the time meaning you never stop, 1 car is done next one rolls in (I haven't stopped in a long time), the space becomes a huge issue, so to have a big empty box permanently in your garage is silly to me..
Heres what I do, I have bought $50 of pvc tubing (1", but 3/4" will work), sew on Velcro stripping, and plastic sheeting (thick stuff came on a roll).
I made the frame with tees and 90s, and the straight pvc tubing (booth ends up being 5feet x almost 8 feet tall and 8 feet deep). I have 1 piece of plastic that goes all the way around it with Velcro stuck on to the frame so it lines up with the Velcro I sewed onto the plastic, then the ceiling is just some .99 cent each air filters from homedepot (20x24 I think). SO the fan sucks the air out of my booth and the most of it comes in through the top filters., My velcros seals pretty good and duct tape helps, I build the booth on top of a tarp.
So pvc frame, air filter ceiling, Velcro door latch, flex duct venting and a boiler vent fan, it works great, I also have a rack I roll right in there for hanging the parts I am painting.
https://www.amazon.com/gp/product/B00SZWOHZY/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
then when I am done I roll it all up and put it under the stairs...
just an idea it works for me, I use led flash light wands for lighting, I have like 30 of them so never a big deal.
As far as blowing up I haven't yet, but I guess it could happen, I move a ton of air through there when I am spraying and its always small stuff, maybe 50 seconds of trigger time at each coat...