I decided to fab up some brackets.
I wanted to do JnC's method, but the housing is really cramped. I would have been much better off springing the extra money for "R34 style" housings. They look much easier to work with.
The stock adjustment brackets allow a goofy kind of diagonal rotation. I decided to make my projector brackets to allow adjustment in the opposite diagonal direction. Between the two, I should be able to adjust them properly.
So, the brackets are going to be a piece of aluminum L-channel. I liquid-nail'ed two washers on the bottom of each, and a 1/4" nut on the top of each. I'll bolt them to the bottom through the 1/4" nut, and tighten them. That will let me pan them left and right. Then, I'm going to use a 4" machine screw through the top of the projector on the opposite corner, allowing up/down tilt.
