Take a look at my build thread, my room is only 11'8" wide after doing the double drywall. It is quite doable. My Jives are on the ocean and should be here in a little under 3 more weeks. I am doing |00||00| for my front row and using Tribues for my back row doing |00|. Wife wanted all loveseat configs.
I recommend creating a floorplan to scale, that way you can literally cut out pieces of paper to represent seats, lights, etc, and see how it all fits in. You can also post the floorplan here for people to critique.