Hehe actually me having the brain i have, and experience in powder coating, and educations for other forms of surface treatment and painting.
Parried with a sleep disorder with a run away brain, I have already devised how such a setup might look.
Me ( hands ) in my last job, though this of course a bit large at least VS what my mind have come up with for painting little lead lumps.
PS, this setup was 300 % slower in painting than i am, used 200 % more paint and at least 200 % more filter in the paint booth, but company thought it was a excellent investment,,,,, i only painted a few hours every day CUZ output and drying oven not larger / faster than that.
What i envisioned in my bed just need a small booth, with a cyclone of course to reuse / recycle surplus powder, a conveyor system, and of course a curing oven, everything of course in a continuous line, there should be no need to stop.
Paint booth with cyclone.
Curing oven probably need to be custom made as they are often large, but a conveyor can make round trips in such a oven before exit to make sure the things are in there long enough for paint to do what it need to do to be good.
I once worked in a place where the curing oven was on top of the painting line.
My mind assume just 1 spray gun would be sufficient.
Conveyor much like in my last job, slug would spin around when passing through paint section.
slugs should of course be only 2-3 Cm apart on the conveyor, it should look like a belt fed Machine gun so to say.
Conveyor speed slow though as otherwise curing oven can not keep up, a " automated " taking off painted slugs would probably be easy to make, but you would probably need someone to put the slugs on the conveyor ( upside down placed with peg up the hollow point )
My sleep deprived mind think this can be done on about 15 - 20 Sq M of floor space.