karch67 wrote:Does anyone know what type of side construction the Scotty's used?
No, I don't know, at least not for sure - but from the pics I've seen I'd say the inner skin was more like 1/4" or even 3/16", then 1x framing, then the aluminum outer skin. You should be able to get a definitive answer from one of the vintage trailer sites.
The Glen-L Sequoia construction seems to be a decent demonstration of 'traditional' trailer building:
http://www.glen-l.com/campers/sequoia-constr-1.html
Andrew