For a few last months I've been line after line putting together the Anaconda Addon Development Guide [1] -- a short and straightforward guide describing how an addon for the Anaconda installer can be implemented, tested, deployed and packaged. I believe it is now almost finished, but it needs review and probably a lot of tweaks based on the feedback, I'll hopefully get, before I'll propose it as a part of the official Fedora project documentation.
So comments, suggestions, issue reports or patches [2] are more than welcomed!
[1] http://vpodzime.fedorapeople.org/anaconda-addon-development-guide/ [2] https://github.com/vpodzime/anaconda-addon-development-guide