Aside from that I do not think anyone has attempted it and reported it as working... be careful.
I'm looking for a projector mounted in the ceiling of a media room, BenQ W1070 is on the top of my short list. Using the projector calculator, it shows that for 125" screen, with 10ft ceiling, 2'8" from floor to screen bottom, the projector should be mounted at 10'5" from the screen at 1x zoom, which is right above the front row seat where I'll be sitting. the room is 17ft long with pre-built conduit and outlet for the projector, which is closer to 14ft from screen. If I mount the projector 13ft from screen to avoid longer exposed cable and power cord, and to avoid noise from the projector right above my head, to get the same size picture, I would need to use 1.25 x zoom of the projector (the max zoom is 1.3). Would that degrade image quality (by pushing zoom almost to its max)?