Amazingly, I happened to read that post (after skipping the previous 40 or so).

I think Dominic understands unicase well enough. I would have thought it was a requirement for all the glyphs to have the same height, but I can's swear to it. Peignot has a kind of unicase lowercase, and does have some height variations within it, but it seems to be an exception. Certainly when I did unicase alternates for Hypatia Sans, I made them all the same height, but borrowed letterforms from both the small caps and lowercase.

Cheers,

T