that's cool! one of my "pet-ideas" is actually to make an AI-agent that does all that typographical work for any PG book to make it nicely printable without any manual labor whatsoever. Maybe that's doable now ...

That is doable. Most of my work was regexp and repetitive stuff. And the typograhpy stuff is achievable with the current state of the art models. Not that I remember what I did, it was 30 years ago.