Well its certainly not impossible. I started with about 20 in a 1x1 meter tent ( a little bit more than 3x3 foot ), very easy to upscale.
But mind you, I would never even attempt this, if I had commercial interests.
In my humble opinion SOG only pays off in Coco or using hydroponic systems.
On soil I would always go for bigger pots, less plants. One plant for every 1.5 square foot are usually nice.
:tiphat:
EDIT :Sorry guys I suck @ non-metric systems. I meant about 45-50cm x 45-50cm/ one big ass plant.
But some form of training is necessary to use the space effectively.