I've seen these clamp lights at the hardware store, they even have a reflector (I dont know how effective it is) but you can position them any which way you need. You'd just need to build some mini shelf or something to mount all the clamps on. Other thing is they're a wee bit expensive if you're buying 4-8 of them, you could probably just scrap the CFLs at that point and buy a small HID. I think they were $15 per clamp light, plus figure about 2-3 bucks a bulb (23w), times that by 8 and thats about 200 watts and 110 bucks, I could get a 150w sunlight HPS for that price from local hydro store. Of course it would probably get hotter.
I'd probably just paint the inside white instead of using aluminum foil. Theres a few other flexible options for CFL mounting just limitted by your building skills and creativity! A stoned trip through the big box hardware stores is always fun lol, I just make sure not to ask questions unless the person seems cool, but generally they're like can I help you and I just say no (polite) and look like one of the millions of other customers who pass through.