Unless you plan on sitting at 23 feet, I would rotate the room and sit at about 11' and then you would have plenty of room to put in 110" screen, speakers, and the rest.
If you only are able to fit 100" screen, then you still have a room that doesn't have a couch sitting in the middle of it. Maybe that works better for you, maybe not.
The 5030 is a nice projector, IMO the HW40ES from Sony is a better choice.
Here's the kicker: Both are designed for home theaters. I say this because a light colored room with light carpet and white ceilings and light colored paint won't be ideal at all. Especially a white ceiling with only a 7' height.
The rules of home theater are dark, dark, dark, dark. Dark flat paint on the walls and the ceiling. Dark carpet. If you want some nice finished trim in the room, then paint it black with dark colors for the rest.
Lighting is another important consideration. Since watching the game with the 'guys' may be a bit awkward with the lights all out, you should plan lighting so that you have directional lighting which is zoned over all the different seating areas and throughout the space. Sconces are nice looking, but should be completely off when the theater is in use. Ceiling cans are the way to go for lights on when things are fired up.
No windows, or complete window isolation is a real must.