The picture won't help much anyway now....I am reconfiguring and I think the new room is roughly 18x12 (I can modify slightly to get rid of the divisible by 2 issue) however the 12 direction takes it up to where a metal support post is holding up a beam. There is another 6 feet available past that, with a window on that wall. I'm not sure what to do about that. Possibly make the room face the other way and have the beam equal with the back row of seating, but then the window is in the back which my wife didn't like the idea of (I don't like the idea of a window at all, but I can get blackout shades or something of the sort.

We have to look at it more tonight. The media room was moved mostly so the playroom would be the first thing at the bottom of the steps, which makes more sense.