GM,

I love your enthusiasm, and with CFL's you can definately put together a great setup on a budget. If you give me a budget, I can help you build a box to suit your needs, you just tell me how many plants you want to do, what you can afford to spend on materials, and I'll help. My first cabinet I had just over 400 into, my 2nd, of course I got a great cabinet on sale, but total cost of the 2nd box was $100, and it'll work for flower/veg, but not both at the same time (but a $10 modification can split the cabinet with sealed lighting on both sides, but ventilation will be a pain)

I'm more than happy to assist!