I was able to do the whole thing, the following is working:
Main page, list of books
link of book leads to book page
book page is more or less the same as before, so that is mostly done.
Automatic pages for tags (working), list of tags (working)
Link from ISBN to Thalia is working.
German date
Tags are working out of the box, easy to expand.
Book list layout: have the image there, some excerpt, nice layout of the content, ... The current list is nice, why not repeat that?
Clicking on book covers opens the book (should be easy to do)
What is not working:
No support for authors (but should be doable)
Link to correct page.
Have as default a list of books of that author (descending)
Have in the directory authors the option to define a page with additional information about the author.
All authors page: should be doable, why not start on that? Not part of the original blog.
Underline for links?: Original blog removed that, should be ok. Color is enough to show what is clickable.
Backlink to all books: necessary or not? As long as only books are here in, perhaps that is ok. Or I move all content (books, blogs, perhaps something else ...) to the blog, so there will be theme pages then.
See https://github.com/mliebelt/mliebelts-blog/issues/58 for some context. The goal here is to do a minimal web site, that shows at least the following: