10 ounces is a pretty big goal, lets see if we can get you there, if you're using a space that size, you can really increase yield over time by making a tiny little clone chamber on the side
Not having to start from seed again will really speed up your turn around, 3ft isnt alot of headroom? it may not be what most people are used to but if you can flower in a pc case, 3ft is a blessing =) you dont need to use a HPS either, you can get 130w cfl grow lights off ebay for like $35 use a couple of those and your heat should come down quite a bit and allow you to flower higher, and there are hydro alternatives, like growing in coco and hand watering with hydro nutes
I plan on doing the same sort of set up soon if i move out, heres a little working sketch and the materials needed
The dimensions are pretty much the same as yours too, Mine will be set up as a perpetual grow, 3 x 2 plants in staggered flowering 3 weeks apart, so when i harvest 2 plants i put in clones vegged for 3 weeks, then 3 weeks later another 2 plants are ready etc etc, a tiny little clone room for 3 plants, 1 mother, and 2 clones vegging, a reservoir below the flowering chamber for a recirculating auto feed system, just pumps water to each pot, soaks medium and excess drains to res.
also small space for fan/filter combo, and space bottom right is a drying room idea ha, passive intake to bud drying room, passive intake to veg/clone room, to flower room then out the filter, just my 2c at a good fully enclosed micro system, im planning on putting it in a chest of drawers 100cm x 40cm x 80cm you can basically have cfls on you plants so if you put a screen 3/5 between top of pot and light you will have enough room to scrog pretty well, flowering 12/12 straight from 3 week clones and only giving them about an 8.5" x 8.5" area to flower they fill that screen easy, chop anything below that and let it concentrate on making cola's. pretty simple way to set up a super effective stealth system for under $500