I have been playing with troff recently.
Motivated on that, I did a presentation on how to create a troff macro package, and I create a macro package.

This macro package contains macro for formatting books: format chapters, generate table of contents, do footnotes, etc.

To experiment the macros, I formatted a book using them.
The book I chose was The Cathedral and the Bazaar, by esr.
You can find the source code of the book (and the book itself, in pdf format) here: https://github.com/phillbush/catb-mb
I formatted it to fit on my ereader screen.