So, seeing that putting up a backing for the projector totally skipped my mind, what's the best thing to do now?
The drywaller has come and gone, the mudder has been doing his thing for the past two days.
a) cut a 19"x19" square in the ceiling, put in some 2x4 studs between the joists, then patch it up again?
b) cut a hole under 1 of the joists, put in a piece of MDF or plywood under that one stud
Kinda of frustrating, since I don't want to waste more of his time..
Here's what I'm referring to - front of the room is towards the bottom right
Another, with the structure behind it. Green indicates the joists, purple are the resilient channel: