Help Mount Short Throw Projector

[BluRayGirl]

Hi I'm in need of some help. I have the Optoma GT700 projector and I'm desperate to mount it as I'm in need of more space within my room. I have a few problems, (1) my room is really small due to bed size, desk and wardrobe and (2) I have a low and uneven ceiling due to an air duct. I was wondering if there was any way to mount it or certain mounts that I should be looking into.
Currently I have the projector on a rolling caddy with my ps3 and xbox and it projects on to a whitish wall.

This is the wall parallel to my bed near the back wall of my room (standing on bed)


View from my desk


Back wall of the room (bed is on the right-side it is a murphy bed)


View from back wall


View from hallway


I've also been thinking of mounting a screen. Would it be possible to mount a manual pull down screen to an uneven ceiling?

Any help would be appreciated thanks