Screen is 104" diagonal in 4:3 aspect. I use this set up for SFIV and all my MAME stuff. I’m toying with building a standup/sitdown joysticks only cabinet for this like the big screen arcade cabinets that have controls and screens separated. I play from about 12 feet away.
With me, for size reference, 3S
http://www.dragonsclaw.org/albums/random/projector1.jpg
Something with less motion for the camera’s sake, in 3S.
http://www.dragonsclaw.org/albums/random/projector2.jpg
Some Alpha 3