The way I was thinking of doing this was one wall at a time. Supporting the floor about 3’ in, and then digging down laying the footings, and building up the wall.
I just have no clue on how to tie all 4 walls together, and then back to the house. I would have this same problem if I was replacing parts of the crawl space wall.
Has anyone done this, or know of a site that shows what they did?