Thanks to my son, we have almost completed the build of Muston Cinema.
4k Projector and a 5:2:2 (Dolby Atmos) setup at the business end and acoustic panels on the wall. It really has made a huge difference to the sound quality and the two subwoofers shake the chair.
Final job will be to mount the plasterboard (once painted) in the alcove behind to block all stray light. I also have a large mounted frame to attach to the board. Then one project completed.