And that right there explains why needing to "bootstrap manufacturing" at this level is a pure fantasy. There's no conceivable future in which it would be neces

And that right there explains why needing to "bootstrap manufacturing" at this level is a pure fantasy. There's no conceivable future in which it would be necessary. Every country on the planet has existing machine tools that, no matter their condition, would be easier to restore than building them from scratch by smelting iron, melting aluminum, etc. Even in the case where you can't get old machine tools and fix them, there are people using e.g., old engine blocks and crankshafts as lathe headstocks. There is simply so much technology cast-offs in the world that can be repurposed into usable items that I think the whole "manufacturing bootstrap" concept is misguided. But I'll admit that it's a fun mental exercise on a boring afternoon.