Ever consider fabric walls? Or sections of fabric walls? Bring some texture into the space...
The green looks to go dark, and it might be a fresh look, while retaining some of the green.
I actually like the green and it's quite unique. The door could be painted a different color.
Ever consider a digital movie poster light box project or two?
Ever consider marble tile for the flooring in the lobby area?
I don't know about the room depth, but I have to wonder if a larger screen might be an update? And maybe
a DIY AT screen might be a possibility.