Originally Posted by nbranco
...what appears to be a pretty flimsy connection between the cabinet and the interior skin. Any ideas?
Unless somebody stripped the threads on the sheet-metal screws holding the cabinet in place, the attachment is not as flimsy as one might think.
Rather than use rivet nuts, you can use larger diameter (not longer!) sheet-metal screws. Do avoid overtightening them. Overtightening can strip the threads.
Rivet nuts provide a wider support area on the backside of your Airstream's aluminum inner skin, which is why I suggested using them. You do not need to replace all of the screws with rivet nuts and machine screws. Those that you do not replace that way should be replaced with larger diameter sheet-metal screws.