I finally have something to contribute to the forum. I came across these photos a while back and thought I'd add them for your view pleasure and maybe a few comments.
I have no idea of the age of the pictures. Very useful for a camp shelter.
There is a redwood log that was hollowed out and made into an RV that we saw at the Fulton County Fair as couple of years ago, I and my wife remember seeing it 40+ years ago in California http://www.youtube.com/watch?v=zxGC7OmXr_w