current game version: 1.5.0.0.3 (all mods confirmed working)
Immersive Inheritance will be a mod that changes the game's breeding system to be based on real-life genetics rather than random picks from coat/marking/pattern pools. It will also add more coat colors/variations. There will probably be some edits made to existing horse textures to better reflect real-life coats.
I've started setting up the data structures for the horse genetics, but the mod is far from finished.