Cool project, I've been tossing around something similar. Someday.
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Instead of 2x4 framing, go with 2x8 or 2x10.
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Another option is standard 2x6 framing with a disconnected 2x4 cwall on the inside. You can really pack in the insulation and also stop thermal bridging, framing sucks at insulating, since the framing members dont line up. Lots of 'building science' to look into when its time. As said, try to take advantage of everything mother nature offers and use it to your advantage. Its pretty amazing how much the sun can heat a place with good windows, some thermal mass and proper structure placement on the lot. Wind breaks with the right native trees, solar hot water on the roof, overhangs, soapstone wood stoves ...
really interesting stuff once you get into it.
Good luck!