I really appreciate your replies, really has allowed me to reflect. While it seemed possible in theory, when I look at pricing, labor, my first time framing, potential mistakes etc it just doesn't add up. But hypothetically speaking if I start with tents, at least I can save up for perhaps creating a loft and one day using that extra 6.5ft as a 2nd floor grow space (one can dream). So here's what I'm thinking: two 10x10 tents with height extensions to start, gets me to 7.5ft. That leaves some room around the tents, maybe just enough for a manicuring table, and a small area for drying which happens to be about a 10sq ft corner closet (framed, no dry wall yet).
Within the 10x10s I'm very tempted to run one with two LEDs each on 6ft light rails (any ideas on make models appreciated- I really want the Lumigrow 650s but too expensive this time around) , and the other tent with three Gavita 600W(?). My budget this run is $6k, a little more available in 3 months to expand on this foundation. For veg upstairs, a room with another LED and 6ft light mover. Will get all the drying etc stuff in 2-3months.