you're welcome.
I was thinking you were talking about attaching something to the bunk area ceiling, the arc area...
Back in the flat ceiling by the AC (and roof vents, etc.) you'll find an aluminum frame, mostly square tubing form what I can tell. The aluminum frame has the ceiling board below, thin plywood above, and styrofoam fill. Of course a bit of wiring for lights and such. Look up into your AC vents and you can see channels cut in the foam to form the AC ducts.
This in my thinking is where the drawings will be helpful to get a better idea of where you'll find metal...and maybe a better guess of where you'll find wires.
What are you trying to attach to the ceiling?
__________________
|