IMO the Airstream motorhomes never achieved the cachet that the trailers did. Most of them were "just another class A motorhome", above entry level but not really exceptional. I guess the Class A competition was tougher than the trailer market, so was harder to stand out. The aluminum skinned model above is an exception, at least on the outside.
You can view the history of Airstream motorhome models from the 70's to the present. Some photos and a lot of original documents, specs, price lists, etc.
http://www.airstream.com/page.php?id=217