I have no clue. One wild idea that comes to mind, probably a stupid idea: maybe fill the room with shelves? I mean, sort of dividing the room up to two separate 4' high tiers, so to speak. Have a 2x10 foot walkway down the middle of the room. Then on both sides of the walkway, have two canopies that are 8x4x4 feet. (one on top of the other) A 1000w HPS per each 4x4 area, making for eight HPS bulbs in the room. At least one plant per square foot of canopy. Maybe substitute one or more of the 1000 watters for 600 watters and go 3x3 for those areas to help make more space for equipment and such.
Or maybe a stadium style grow, like Heath's high plant count stadium grow(s?). Multiple stadiums for that space. Maybe stadium isn't the right word... I mean a hydro set up where the plants are stacked directly on top of each other and are angled to the light, rather than like a bowl type stadium.