TexasGrass, I've got two store bought cool tubes hooked together in one of my cabs and, with all the twists and turns in my vent line, plus the carbon filter, my 467cfm fan is probably at about 50%. I have no heat issues whatsoever. The MH bulbs I have are a real tight fit - about 3/8" clearance all the way around - and they still stay cool.

You should be fine, although you might have to trim your mounting bracket some, but judging from the quality of your work, you seem to be all set up to do that easily enough.

If you don't mind a suggestion, get some caulking and caulk real well where the 2x2's meet the walls on the inside of your cab. Those small cracks are a great place for mold to live and breed.

Good work on the cool tube and the cab! :thumbsup:

PC :thumbsup: