Here's a quick mess I put together in paint. If more detail is needed I'll sit down one weekend and play around with a more sophisticated program. If you have any specific questions fire away. I just finished repainting the room a midnight blue, I'll post those pics later.
I'm looking to put the screen over Window B. Up front I'm contemplating building a stage to surround the screen and hold the center left front, right front, and perhaps the sub. (Though the sub is in question depending on optimum sound) The right surround is looking to go between the door and window A and the left surround will be positioned between the entrance and the wall to match its counterpart. The rear surrounds will go behind the platform seating. I will post pics on the proposed position of the platform and seating later.