Some photos from the install of my 100" wide dual-roller CIW masking screen from Seymour:
2: front cover removed
3: the drywall lift I rented
4: 2x6 cross-beams screwed into the DIN rails
5: screen on lift in place on ceiling
6: screen bolted to ceiling
7: screen down, 1.78 aspect ratio
8: mask down, 2.40 aspect ratio
I spent about 23 hours this weekend working on this install, mostly by myself, and with one other guy for an hour or two. The hardest part was positioning the screen exactly where I wanted it without any help. Climb ladder, measure, move screen, move ladder to other side, measure, move hoist, repeat.
Finding the joists in my lath & plaster ceiling was also a bear, as three different electronic studfinders were all having trouble. In the end, the $5 magnetic nail finder worked best.
I put a total of 8 wood screws into the 2x6s from underneath the DIN rails, then slid the rails back into the slots on the case and tightened them down. Then raised the hoist into position and put eight 1/4" lag bolts through the beams and up into the joists. When all done I tried pulling down on the case with about as much weight as I could and there was no movement. I probably would have been fine with a total of 4 lag bolts.
While the hard part is done, I still have to reinstall all the entertainment center & equipment under/behind the screen tonight. Getting the projector installed is a whole separate project, still in progress.