I'm the creator of Overlay Map Alternate, a parchment map mod, which replaced settlement icon and roads are drawn with dash lines.
https://steamcommunity.com/sharedfiles/filedetails/?id=1821556122I'm preparing making another parchment map mod to show the historical administrative division of each start year.
But I didn't find any map fits for the map in game, so I post this discussion.
Could somebody offer the data of map projection?