my grow space was very similar and i divided it in half, 1 side for veg/clones/mums and 1 side for flower. my point is that the 2ft depth is hard to work with. it is doable but raises a few problems, heat being the biggest. with 3 400hps bulbs you should use 3 cooltubes daisychained with a 8 inch vortex type fan. that sounds like overkill as the 8inch vortex is 747cfm but you will be supprised at the speed those lights will heat such a narrow space. also your best grow technique would be scrog or sog. large plants do not do well because the narrow space is awful for light penitration and the larger plants will end up extremely "leggy" with only decent buds at the very top of the canopy. i worked with the 2x8 space for 2 years so i am speaking totally from experience here. good luck. btw i don't know if i've told you this before but my 2x8 closet with 1 veg chamber and 1 flower chamber gave me just under a lb every 8 weeks.