I got some dimensions. Not great at sketching so let me see if this helps. BTW: this is a different room, changed my mind about the long, skinny room.
Rectangular 12 x 15
The 12 foot sides have doorways right in the middle so no good. So the system will be set up along the 15 foot sides.
Sides referred to are from the probable listening position.
The front side has a two foot opening on the right side.
The back side has a window right in the middle.
The left side has a door in the middle.
The right side has a opening the size of a door in the middle.
I'll probably attempt a sketch later. My plan at this point is to put the TV in the middle of the front wall in an entertainment center. The speakers will be two feet from the back wall and eight feet from each other. The listening position (captain's chair) eight feet from the speakers which will put me 5 feet from the back wall (following the two thirds rule).
I have several DIK absorbtion products I can use. I will use the tri traps along the back walls and they will serve double duty as stands for surround speakers. There will be a couch and several other cheap chais in the room as well as racks for the CDs and DVDs. I can't take pictures of the final product because nothing is there yet.
I'll try to do a sketch if it'll help but it'll show the same thing I just described but not as well. I'm better at words than pictures.
Any suggestions?