Seems like the best idea would just be to try to plop the new plant next-door to the existing plant, then (and to keep doing that.) Would make the logistics of

Seems like the best idea would just be to try to plop the new plant next-door to the existing plant, then (and to keep doing that.) Would make the logistics of sourcing the same "everything" a lot simpler. Intuitively, I'd expect that fabs would plan for this in advance, ensuring that 1. everything they buy, they have ways to get N of the exact same of that thing down the line — the same way that NASA missions contract to ensure they can get precisely-specced replacement parts decades down the line; and 2. that they build their first plant for a given process node in a huge empty expanse of land (much larger than what Plant No. 1 needs) where they either buy all that land ahead of time, or at least have a contract with the municipality to retain right-of-first-refusal on purchases of that land.