The wall is super smooth, and my wife is a professional textile designer/painter and you don't see a stroke when she paints. That's why I thought the paint would be a good idea.
The room has a regular window and a tiny one, which I plan on putting up curtains (though the shades are wood and keep out most light. I also might attach black plastic bags to keep all light out. I only watch movies in the pitch dark. Black plastic bags work great especially when making a movie trying to make it seem like it's dark in the middle of the day. They just ain't pretty.
The projector is the Epson 5010.
Now here's the part I've had conflicts with. The room is basically 11 x 12. I planned on putting the projector 10' back and getting about a 103" diagonal screen, which is good enough for me. But, some people at another site are saying it won't work.
I do in the long run have a large living room 20 - 25' x 15' - 20' (I haven't measured it lately. But, it's large) But, it's an old tudor and my wife won't let me keep it in there. So, I'd have to break it down after each showing, and in that room I'd definitely need a screen, there's no extra wall. The small room will be set up especially as the theatre room.