thanks for the feedback guys, i'm going to scale it back and run 2'x2' w/ 250w HPS. This will make heat control a lot simpler, although i have plenty of space outside the cabinet to set up fans etc.

Also i intend to grow 9 inside, in a 3x3 grid. Using 6"x6" pots this will give me about 3" of space around the perimeter.