I think it also helps to decide early on whether you are going to use RV grade materials or standard home grade materials. The interface between the two can be a challenge but it not too difficult. I've gone with 90% home grade appliances optimized for off-grid applications and am very pleased with how things have turned out. My framing is steel tubing with plywood and foam (on either side to minimize thermal bridging) with aluminum siding. I'm happy with how that has turned out as well.
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