Thanks, Orin. I've been a longtime fan of earth sheltered, but it's not a realistic choice for this application. For multiple reasons. Space - linear and vertical, ingress and egress, lay of the
land. As an aside, my wife and I stayed in an earthship in Taos County, NM some years ago and loved it. Would have been my first choice for our domicile, but we opted instead for the 300 year old farmhouse on 5 acres. The opposite of thermal mass and climate stability. But we are homesteading.