Ok so I have got my setup figured out I just need a few pointers of advice on exact numbers and sizes.

in a 7x7 foot area I want to do either a 8,10 or 12 bucket DWC

Should I use 10 gallon buckets instead of 5 gallon because I have both? Bigger plants?

Its going to be under two 1000 watt hps lights and I might add a 400 watt hps.The walls have mylar and vented reflectors.

The plan is to grow 12 HUGE female plants that fill up the area completely and yield 6 oz's each. Or 10 plants that yield 7 oz's, or 8 plants that yield 8 oz's each.

I could also build a HUGE SCROG over top to maximize yields too right?