[Silvertwinkie]

I'm not really a vintage guy, but I think I can say this fairly safely.

From what I've seen, Airstream uses a bunch of standard parts that can be purchased at any Home Depot, etc.

I would assume that if you do a body off frame rebuild, that you should be able to use almost anything you desire that is within reason. I like pressure treated lumber (or in this case plywood). The coach has been designed for that weight. The other thing to consider IMHO is the fact that some of the materials you mention I do not think have been tested enough in the harsher moving application of a trailer. Most of those materials are stationary. I can say first hand in the '03 Bambi, that some of the engineered wood cabinets, etc tend to be less able to hold screws. I have had a few pop on me whereas I think real wood installed correctly would have held it better. I am sure the same holds true for some (not all) other engineered products.

One thing to consider when talking about insulation is the "R" value. There are several options out there, but as far as I've been able to see, fiberglass batts get better "R" value than most around. You can get it enclosed in plastic, faced, unfaced, etc. Whichever way you go, make sure to wear protection when dealing with the stuff.

Eric