I was also wanting to create a decent finishing room. Well this job turned out to be bigger than ben hur.
What I ended up with is pretty cool. I had this dusty dark space under the house which you can see in the pic is now a workshop extension for some of my machines. The bench is on top a retaining wall and is 4.5m long. In between each pillar is a bay with power and dust extraction outlet. i used PVC piping to my extractor. Ducting also runs into my normal workspace through the wall. I got a whole bunch of old shop lights from the salvage yard for 5 bucks each.
I need to move the machines around a bit so i made ducting out of dryer hose which is strong enough but folds up into a really small space out of the way, unlike plastic ducting. I just cap the inlet when not in use instead of using blast gates. The inlets are at bench level so I can sweep crap up into them easily.
The white door at the end is to my new spray room. It is great to have somewhere clean to do this stuff and not have move everything. It is also in between 2 pillars (about 2m wide but is about 3 metres deep).
I just framed it it pine and filled it in with giprock. An explosion proof fan was going to be over $1000 so I decided to use positive pressure on the advise of the spray paint shop guy. The room is totally sealed. The lights are outside and shine through clear PVC from the side not the top. A fan pressurises the room and blows the fumes outside through 2 300mm ducts at the end. It works brilliantly. The fan clears the air from spraying in about 15 seconds. You could take you mask off after that if you wanted to. Hard to take photos.
I also made a turn table out of a lazy susan. I sit the guitar on the legs which are tall enough that spray does not bounce up underneath. I put a disc on top to rest the neck on it.
I have done 3 guitars in there now that had been lining up. I hated finishing before because it was such a hassle to make a space somewhere. Now it is easy. Dom
