Kurt Gavin wrote:
I'm thinking about building a cabin and need some sources for info and
design.
It would be about 500 sq ft. and would have a well and septic system, and
would be built and insulated for winter conditions in the Rockies.

Even a small cabin can be hard to build up in the high country.
Building codes can be restrictive and actively enforced. Well and
septic can be big problems. Some old cabins are grandfathered but they
never have any water or septic save for running streams and snow melt.
Try to get a look at any newer cabins in the area. If you really wan't
such a very small space you could consider a travel trailer or camper.
Some are suitable for winter use and have self contained water and
plumbing.