Sure, I realise that that would still not result in a bootable HD - but that's the case with any HD on a pre-Plus Mac, correct?
Yes, my point being that the routine in the 128K ROM should only be applicable at startup and therefore some kind of mounting software would have to be written to load a drive after the fact, even if it's possible to use the 128K code wholesale.
I see discussion of such is proceeding at
the parallel 'fritter thread.
Yes, I've duplicate posted all around the web ... I have no idea who is lurking where, but the 'fritter site got some prompt attention to the technical side of the project ...