the aluminum foil can cause "hot spots" sometimes they can be a problem, the spray painted white background might be good enough. maybe just use the foil to shape the ceiling like a reflector.
also If you smoke multiple blunts a day in your apartment then i dont think the smell of a few auto flowers would be stronger.
If you can you might want to throw an osculating fan in there.
oh yeah i found a sleeping bag bunjied around that vortex will stop most of the sound it makes just dont block the intake.
