I'm wanting to build a wooden box OR either buy a metal cabinet for a grow box. I have previous grow experience with a 400 watt HPS in a 3.5'x3.5' closet but that was in another state and place. I am legal, but still want to be stealthy as possible as I live in a mobile park. I have a CanFan 5" hi output fan with the CanFilter 9000 which worked well in my old closet. I don't even have a closet now so I have to make or buy a grow box. I'm not using my 400 watt HPS, I just ordered a 250 watt HPS Galaxy electronic ballast and I'm only going with a 2' wide x 3' wide grow space. Before when I grew I always grew from seeds and this time around I'm going to get into clones. I'm sticking with soiless mix and perlite as I have experience with it and always done good with it. Maybe someone could post some links to pictures of home built grow boxes or maybe some office supply metal cabinets.
I considered a metal grow box myself since you could definitely make a very stealthy box using a metal filing cabinet. The problem is that you need to be able to cut a lot of holes into it for ventilation and wiring, which can be a real problem if you don't have the correct tools.