Tomorrow I'll be two weeks into a cfl grow from seed. Here's some picks of my box. Light height is adjustible based on how tall the plants are. I plan on scrogging two plants in here. The small fan in the side is an intake, the other is just to move air away from the lights and general circulation.
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It's about 2.63 square feet, and 10 cubic feet. I have a 400cfm Active Air inline fan in the top sucking out the hot air from 12-26w 6500k cfl's (7300 lumens per square foot). It still gets quite hot in there near the top of the plants, and my intake is blowing in cool air from a shaded area outside. The fan is so powerful I had to brace the sides of the box, and the door with wood because the fan was making the box implode. I think you may need more than a couple PC fans.
What I did is use three power strips that have 7 outlets each. Buy 12 outlet to socket adapters and put one in every other outlet on the power strips. I put those plastic safety plugs to keep babies from getting shocked in the outlets which are empty to keep debree from getting in there and starting a fire. Then just hang them over a thin strip of wood. I used a squarish shaped strip of moulding and just run it between the bulbs so that the power strip sits level across it.
