So, I finally gave it a go and built my own WordPress theme.
Not nearly as painful as I first thought it would be. Still has some rough edges to work out, but by-and-large I’m happy with the result. I’ve been wanting a full-on “Book” styled theme and, being unable to find one out there, decided to make my own.
I’ll decide later if I want to post the package on the WordPress.org site for others to use. I kind of like being unique.