I'm always thinking of the best ways in stealth. I'm thinking of one of those tall Igloo coolers w/ a small 2 plant ebb and flow, CFLs, and PC fans. Tiny, but could work...and cheap. There are those companies that sell the two-door $80 metal office cabinet with lights and fans for over $1400!?! People are always throwing out storage and filling cabs or sell at yard sales. A 48" high cab would be great...just drill some holes for fans, white mylar on inside, weatherproof, hydro, ba-bing!