Congratulations on your airstream! We just bought 1976 Overlander, as well. It's further along than yours - the previous owner gutted it and repaired the issues that he found in the belly. BUT I'm excited to follow your renovation and, as we're a few steps ahead, provide details about what we are doing. We will pick it up in the next few weeks and the first thing we are going to do is leak-proofing. We'll remove the interiors skins and caulk all seams and rivets, replace gaskets, etc. No sense in doing work on something that is taking on water!