Really nice set up. Did you help run wires & paint? Dark carpet would be better but having the black ceiling & wall helps keep down stray light from the screen. It is similar to the set up my older SiL has with a black wall around the screen but he has a white ceiling that reflects so much it seems to be brighter than the screen sometimes.
Looks like a pretty good choice of seating where the rear of the seats doesn't cover the back of the head. Maybe in the rear auxillary seating it does, but it wouldn't matter so much there.
Is that an AVR sitting right underneath the projector? That's pretty convenient.
I too have a projector set up, not a huge screen just 8 footer. And a Panny 8000 projector. I used to say I might have a $200 futon to sit on but I have a$4K projector on the ceiling! That's one of the reasons I'm not so fanatical about ripping everything I can & enjoying thru Kodi or J River. I mean, the shots QQ friends post with the album pic, track listing, etc is very impressive. But I'm not going to burn a $400 bulb just to look at still picturres while listening to music. I'd say the conventional light emmiting flat panel display is more practical for most people. But it just doesn't have that cinema feel. Anything else is just watching TV.