Ribs and Studs
Ribs and Studs--sounds like a gay barbeque joint.
Thanks for the picture. It's very helpful, and just what I suspected based on pushing and tapping on the interior wall. I've seen some schematics in an Airstream book that showed the ribs not at the outside edge of the windows, but set in about 8-10 inches. But those were on newer models with the two additional smaller front windows. I'd have preferred that design given the dinette benches I've built into this space. But I can work with it.
Now, a second question, since you have access to the ribs and front window (that is a front window in your picture, is it not?). I have to completely replace my front window, frame and all. How is the window frame attached to the ribs? If I peel back the outer skin, can I drill out rivets or remove screws or bolts and lift the frame out? Would it be easier from the inside? Can you take another photo of the window framing?
Thanks again, Don.