I know the point of it isn't to run on new hardware, but this would be a way to learn it on a stable platform without having to worry about dealing with constant problems from old hardware before trying to implement it on said.
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Being that it is for a post-Collapse world would be nice to see it ported to run on RISC-V (not trolling) because RISC-V is already the subject of "Computer Organization and Design RISC-V Edition" and very well documented, but also going to be increasing the architecture with the most resources through student, assignments, etc, but also to salvage from existing electronics.
Thought the author's timeline is 2030, which is a bit too soon for that, but by 2040 I think my argument holds.