Why upside down??? Is that so it is easier to reach the buttons on top of the pj? What bolts do you use to connect the bottom of the pj to the shelf if its upside down? Does anyone have any pics of this?
If I want to build a 91" screen (80 x 45), how high does the projector have to be mounted upsidedown to prevent having to use keystone... I guess this leads to the question of how high is the correct viewing height for a 91" screen, and whats the method of calculating the projector mounting height based on screen size and height off of the ground?