ScrOG wouldn't be feasible under there, sorry. no room for transplanting and even if you started in your final pot size, that space would really restrict your ability to prune and train the plant.
LST would work. i'd get some plywood and something to make your corners with (little bits of a 2x4 maybe) then some wood screws. paint before assembly, and when you're getting the paint and plywood from home depot or wherever, grab a 4" inline duct fan, a drill if you don't have one, a 4" hole bit, and maybe the planters depending on what they offer. looks like you could get 8 CFLs in there, so maybe also a 4 socket vanity light and 4 Y-splitters. this is a pic of my CFL setup to give the basic idea of what i mean.