that's amazing- the shame of doing sog is that you've got 6 vertical ft to work with. i'd be tempted to do one or two plants like mexiblunt grow a couple sideways. my space is pretty much the same size as yours, and i've got nine plants in there... they just went to flower at just under 2 feet, and it's really crowded in there... i can only see the sex of one of them so far, so we'll see how many i end up with in the next week or two.
remember 6" pots won't give you much room for root growth ( if your going to use soil not hydro ) so you'll need to do something like a SOG grow GOOD LUCK
remember 6" pots won't give you much room for root growth ( if your going to use soil not hydro ) so you'll need to do something like a SOG grow GOOD LUCK