Hanging the screen and projector
I had two critiria for hanging the screen. one, hang it under the sloped portion of the ceiling to maximize viewing distance, two, mount it from the ceiling and not the wall to allow for ceiling to floor curtains to be installed and operated with out interference. I thought about a number of options and decided making my own bracket which returns the ceiling from its angle back to 90 degree's was the best option.
I start buy cutting some 2x2 stock at an angle that brings the ceiling back to 90 degrees. this angle was 55 degrees.
prime and paint them to match the ceiling
attached to ceiling, you can see here how this brings the mounting surface for the screen parallel to the floor.
install the screen center to the room. The plan is to install trim across the room that hides the ceiling mount and the screen housing.
the screen needed to be shimmed slightly, to do so I used some cut washers, slightly unscrewed the screen, slid the washer in and tightened. I got this idea off this forum somewhere, unfortunately I couldn't find the original poster to give them credit.
I picked up a projector mount from monoprice, the projector itself (benq w1070) has vertical adjustment but no horizontal adjustment, this means you have to get the lens centered on the screen when mounting it. I calculated the mount location by finding the screen center and offsetting it by the offset of the lens from the mount location on the projector.
Ceiling plate installed, lagged to ceiling joist
extension pole and projector installed and leveled
all aligned, yes, the fan light is blocking some of the image and will need to come down.