From what I see, yes it would work, with a limited number of strains that do well in SOG. But practical for canna? As someone else mentioned, that's a lot of plants to care for. I'd set up a system like this like a cleanroom also. Seal the room as tight as possible, install an airlock and a decontamination room. Remember, the tighter you pack the plants in, the faster disease, etc, spreads.
Seems to me when all is said and done, vertical systems like ttystikk builds would be more productive, easier to maintain, and much less expensive. And using LED strips or QB type boards, you could pack several large plants into a small area, a two sided light between screens, run a moderate power and run close to the canopy. I'm sure ttystikk has already thought out these and similar concepts.
But if you are going to run with this, we'd all love to see it in action and to prove us skeptics wrong!
