Don't be hard on yourself. I thought we had done a good job of "due diligence" on our first shop. Things did not turn out as we had hoped (see my blog for details). I like to think we'll eventually enjoy our Overlander even more having gone through some adversity.
The great thing about Airstreams is that almost anything can be fixed. It's usually a matter of time, money, more money, more money, etc.
Seriously, the Airstream community is why we went vintage Airstream. The people here are fantastic. The support is great. The cumulative knowledge is amazing. With sincere apologies to faithful, if Airstream be for us, who can be against us?
Keep the faith.