Below are two images - one of the entire basement and one with a closeup of the theater that I (crudely) drew. The HVAC ducts running horizontally through the center and bottom (in drawing) of the basement pose a limitation in the overall width of the theater. The ceiling height throughout is around 7' 10".
So, the theater measures 15'11" deep by 9'10" wide. With door access to the theater coming from the rear, I think my only option is to put the second row of seating on a small island. I'm not interested in excavating down so I think this will have to do.
The riser/stage in the front will house the large Von Schweikert front towers along with the Rogue Audio tube amps to power them. The remaining theater A/V gear will be located on the right wall when walking into the theater and there will be a projector overhead as well. The room will be used for two channel audio as well as full surround sound and I plan on loading up on isolation clips, Green Glue, bass traps, etc... I'm not sure what to do yet for the subwoofer(s). Looking at some of the other builds on here leave me wishing for tray ceilings, rope lighting, etc... though we'll see where things end up!
Kindly let me know your thoughts/limitations/concerns. I recognize that the space isn't enormous and while I'm estimating that most of the listening/viewing will be done by myself, I don't see a need for physical seating of more than four and other kids can use bean bags.