John. the ancient Greeks found a room ratio the length 1.5 times the width and ceiling as high as possible to obtain the best acoustics, that still applies to today . As to a screen , paint your plaster , (dry wall) it saves you a fortune , and there is little difference in quality between that and a 2000 dollar screen , I know because i have done so , and so have my friends . Put most money into good speakers , acoustic treatment to the room can be added later anytime . Get a cheap projector as the projectors are getting better and cheaper every day , latter you can get a crash hot one for bugger all . Hope my suggestions are helpful to you John . Kind regards , Alan .
