Looks like a place most of us have been before when restoring an old Airstream. Now you get to really dig in and see how much of a disaster you got yourself into. The good news is that if you keep digging, you might find some lost money to help you buy the stuff you need for the rebuild.
In our first Airstream we found a Hippo alphabet card, an old green pen, one harvest gold glass pepper/salt shaker, and a name tag for an Airstream resort in Florida. I shouldn't forget the half chewed rubber cement tube, lots of fish hooks and part of Marcia Brady's red corduroy jumper that was all stuffed in mice nests behind the tub. No money but a bit of stuff to discover that brings some light moments to the situation.
Good luck on your project.