I am having a home manufactured for me. I am having one of the walk-in closets in a spare bedroom made into a "darkroom". It will be 6' x 6', with a stainless steel sink and counter, two 2-outlet 100v, a drain in the floor and an exhaust fan on top. I am thinking about lining the walls with mirrors. Is this a good idea? Any suggestions on what I might be missing. Thanks.