Yeh... I'll have a look tonight... if its too low I'll get another bracket closer to the ceiling, or see if this one can be modified to be closer.
Other wise I'll just assemble it in the roof and pass the pipe through the ceiling.
You may not even notice it once you adjust those settings, but i personally find it irritating even when you adjust the keystone setting. My projector is parallel to the ceiling and the top of my screen is about 30cm below the center of the lens