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Some of the most difficult things would be ready access to quality materials in one location. Have you ever read the Toaster Project? He makes some mistakes, but spends most of his energy driving around the UK to various resources. I think I could bootstrap machining tools.
I saw that, and it's definitely the main issue not just "knowledge". But there's some tech that's more viable than a toaster. One reply mentions a bicycle, which just require metal, if that.
I think as long as I had access to iron and fuel, I could get all the way to lathes and mills. It would take a decade maybe. Quality would be questionable. After that who knows.
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