Ooof, that's tight but I don't see why it wouldn't work if you are shooting for a 4x8 or 5x10, and not imagining cutting sheets over that size. Touch base with the folks over there concerning overall dimension of the table, my 6' table has a top that is 83" across, and another 18" worth of gantry & the tread that the wires are routed through, but I'm not sure how that scales. Are the double doors totalling 6', or would that be 2 6' wide doors? My concern would be forklifting a pallet into the room would have to come from the long side of the pallet, and I still have nightmares from the time we got 25 sheets of acm and the forklift operator just pulled the pallet apart trying to tilt the forks on the short side.
Since you don't have a lot of room, here, where do you plan to store material? I guess if you're processing everything with prints before cutting it doesn't need to be stored in the CNC room, that's just where my mind goes.
Did you ever check on your building's power supply capacity? On our 3 phase 240v setup, it draws ~63 amps (FLA full load amps, that'll be the power consumption while running), but on startup it draws 775 amps for 3 seconds or so. This required a special slow blow breaker and is essentially all of the power capacity supplied to my facility... We were very close to paying to pull a new service line from a transmission line several blocks away, and that would have cost tons more depending if the utility company billed me for it.