Chad,

I hate to disagree with growhand and no disrespect is intended. Those plants need to be closer to those CFL's otherwise you'll end up with charlie brown christmas tree looking plants. Also, loose those hooded reflectors and set your bulbs up horizontally instead of vertically, more light over a smaller area, and KEEP THEM CLOSE to the plants - With CFL's 1-3" is good for optimal node lengths.

Use some of the black draft sealer on a role for doors and windows on the edges of your box to prevent light from leaking.

To maximize airflow from bottom to top, cut away 1" from the top shelf facing the door or cut in a small hole to put another small fan. If your planning on flowering in this same box the cut aways won't work and you'll need to vent them separately, and actually seal the shelves to avoid light leaks.

As far as keeping the plants small enough to fit into the cabinet, look up LST techniques. I was able to turn what would have been a 4 ft tall pinapple express into a 12" tall pineapple express bush, and yielded a fair bit from it, using a similar cabinet, just more lighting.

Also keep in mind if your going to flower in the bottom you'll need 2700s not 6500s

If this is your flower box, fix the light leaks and your air issues, adjust the lighting, and your good!!!