In particular, my idea was to port the old Minix OS to the Macintosh SE/30 (for starters) as a native OS, rather than an application running under System.

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Personally, I think this is a great idea. I have a copy of the Tanenbaum textbook (2nd ed, I think) on Minix here, and I would love to dive into it.

It sounds like you are aware of MacMinix - i wonder if any of the code in that would be of use?

There's a little discussion of Minix/MacMinix in this thread, and a couple of others scattered around the place.

I note this possibly helpful hint:

There were other 68k versions (Atari ST and Amiga, for instance) that were more "bare metal" and thus would provide more in the way of useful bootloader/ initialization/ etc. code.

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