I dremeled out the mounting points for the front flap. It just sits on top. The rear flap is still functional and between the back and the lighting fixture is how I feed and add stuff. I have about 3.5" of clearance between the fixture and the front, plenty of room for a reflector and bulb (I measured it last night) If I get a 2x65 retrofit, I would be able to add on to the top unit, and use one for the sump (Provided I could fit one in the little space.) We have two extra 65w 50/50 bulbs from when we first got the fixture.
I messed around with some extra 80mm computer fans I had, some DC plug I had for something I haven't seen in ages, and a nice little switch. I wired it up last night and got it working great. I may have to find some quiter fans, these move some nice air but are kind of annoying. I was also thinking maybe I wouldn't need them on all the time, just a couple 15-30 min intervals throughout the lighting period. I measured it up and I would be able to mount one on each side of the hood, flowing air in the hood, over the light, and out the other side. The layout looks pretty nice and works very well.
I may have to go down to a 60mm fan though for making sure everything will fit and still be structurally sound.
I may just start this project this week!
Anyone have an old 2x65w PC fixture or retrofit kit sitting around? (Straight pin preferably!)