have a themescene h30a pj and beamax r 77" screen which my grandads gonna help me put up on tuesday, however i'm not sure how i go about doing it all to ensure i get the proper setup for the best picture... the beams in the ceiling run front to back and the room is about 13' long the projector calculator at projector central gives me a distance of 11' odd for the correct throw. however how do i make sure this is correct without having to mount everything and then try to get the image to fit. as i dont want to have to do it over again. should i mount the screen first where i want it and then the projector? however if i do that chances are the ceiling beams wont be in the right place and the projector wont be centered in line with the screen. but if thats the case then the screen cant be mounted in the middle of the wall can it? the type of mount i have is a themescene branded mount that allows some drop and has a joint to allow side to side and front to back movements plus it swivels. anyone else mounted their kit that can provide some pointers/insight on this? ta Ciq.