Thank you for providing this to the community. I am looking forward to trying it.
I've been in the laborious process of creating my own fictional league, which I intend to start in v12. I was about to get under the hood of world_default.xml, so I now intend to look at how you adjusted it and learn from that. (I also intend to play your league

).
The map is astounding. Was this done in Adobe Illustrator?