Farrier in Washington Co. Oregon, I have a dream of building an off grid home as well, part of the reason I am recently single. My plan is to build a passive solar home with radiant floor and Masonry/Swedish stove. Having done my research, I believe the best construction method would be Double Wall stick built, rationale, lumber is a local product and easier for two people to build with, my belief is you don't have to go total Passive house to achieve significant gains in efficiency without the astronomical cost. I am confident that two people can build a home with cash in hand and wined up with no mortgage and damned few expenses. By the way I have cash in hand to start, and as I have many other skills that would lend itself to this endeavor I am confident in my ability to see this through. Also I am still a working farrier with a well established clientele that would love to see me stay in the area.