Some good questions, but got 42.
I think my methods of research into a subject has paid off again. A year ago, would have got close to 20, if that. First Mac was MBP, (since obtained an LCIII and Newton amongst other things), so I really put this down to learning about the history.
I agree though about the Mac OS question, it didn't exist under that name until 7.6. I considered all the options and settled on the 128k Original Macintosh, but it was wrong.