I feel like the materials are whatever is found on site.
That may mean that a machine may need to be able to sort, smelt, sinter, form, ram, engrave, or otherwise process whatever it found on-site.
That's definitely non-trivial, but in the sense of making a CPU with millions of transistors, and not in the sense of Mt. Rushmore. The R&D costs will be astronomical, but there isn't much there which is /fundamentally/ expensive, at least so long as you're not going to deep.
I can describe a number of beachheads and early markets -- places where you don't need all of that at one, or ultralow costs. I think the Boring Company has a decent one.
That may mean that a machine may need to be able to sort, smelt, sinter, form, ram, engrave, or otherwise process whatever it found on-site.
That's definitely non-trivial, but in the sense of making a CPU with millions of transistors, and not in the sense of Mt. Rushmore. The R&D costs will be astronomical, but there isn't much there which is /fundamentally/ expensive, at least so long as you're not going to deep.
I can describe a number of beachheads and early markets -- places where you don't need all of that at one, or ultralow costs. I think the Boring Company has a decent one.