Great guide, two things though
I notice you mention Prowlarr, I’d probably suggest it and jackett - i ran both for a while then dropped Jackett as all my matches were coming through Prowlarr and its just less admin to add sources there once and have them add to the rest of the servarr apps
Also, you might want to look at https://www.audiobookshelf.org/ - A great plex like app for streaming audiobooks specifically
This article covers it in depth.
https://www.rapidseedbox.com/blog/jellyfin-vs-plex
It’s a different answer for someone already invested and paid up for life on plex though than it is for someone looking to do their first install.
I have audiobookshelf, along with readarr for downloading and the two have a totally compatible naming structure configured so it works like a dream. Not 100% sure it was that way at default or if I had to configure readarr to match what audiobookshelf needed.
It’s annoying it won’t subfolder the server under domain for reverse proxy, but that’s not too much of a worry.