The cabinet is and old dresser I gutted and painted flat white. Its standing on end and is approximately 5 ft tall and snuggly fits 2 buckets in the bottom. I've got a 400w mh hps I'm going to hang from the top from a couple eye hooks I had laying around. So heat is somewhat of a concern.I'm not sure where I should install fans. I have a plethora of old PC fans at my disposal. Would it make more sense to exhaust out of the top or side? Also how do you keep light from blasting out of the fan holes?