I used to have a place that had an add on which was just posts dug 12" into the dirt holding the roof up. They then added some 2x4's between the posts hung plywood from that and called it finished. I did like gasstingy and build a full supporting wall 12" in from the outside then removed the outside wall, dug and poured footings and a foundation then put 2x6' walls up and anchored the roof down to them. It was a pain but perfectly doable 1 wall at a time. Just don't finish the drywall inside until you're completely done since everything creaks and groans as you put it onto the supporting wall and then back off.
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