Will the ceiling lights in the booth be OK exposed liked that, instead of sealed off like the wall lights? Being a painter I'm sure you wouldn't do it if it wasn't safe.
When I was 16 I bought a 79 ramcharger off a lot, weeks later I was underneath checking stuff out and found a SnapOn ratcheting screwdriver laying on the framerail. I could never figure out how it stayed there considering the way I beat that truck, but I still have it 22yrs later.