I was thinking something like this theater. Instead of the step in front, it would have a bench across the front, giving more room for a low center channel and some serious bass. His speaker cabinets seem to be closed on the side. I would want to leave the sides open so the speakers don't get boomy. It would look identical because it would be covered with fabric.

http://www.avsforum.com/avs-vb/showthread.php?t=996159