room dimention question

It's only a problem if you think it is. It is what it is. Go with it. That's not all that low imo.

only if your Wilt the stilt Chamberlain?

Having a low ceiling may reduce reflection times from the ceiling. Consider using insulation between the ceiling framing and completing with fabric rather than drywall - atleast where you would expect reflections from the speakers to the listening position.

Run 3 dedicated circuits, all on the same phase, if you have room for them on you breaker box. If you have the walls open, installation should be easy.

My experience is that the first reflection off of the ceiling has a negative impact on the imaging. The best sounding room for me was a very high ceiling with a vault that is lowest on the speaker wall and goes up as it goes to the back wall. Won't work for you but there are lots of products that address reflections.