Our DRH Slimline screen arrived. http://www.drhscreens.co.uk/slimline_matrix.asp code R231130W The problems started when we unpacked the thing. There were no screws or anything to mount the screen. Then we pulled out the screen to the fullest extent and could not get the screen to go back into the case. In the end we mounted it upside down - luckily it fitted our room perfectly as the heavy case part rests on a black cabinet and I nailed the top of the screen via the metal hook. I don't need it to rewind or anything - and several people think it looks good actually My main query is is there anything in the science of the screen to suggest having it upside down will affect the picture?