This mod is rather simple: overwrite the Nagaoka campaign with factions who were part of the Ouetsu Reppan Domei (Northern Alliance) and make a large faction from the beginning. The Northern Alliance is represented as one faction, and, if you choose to play as them, you'll have a pretty big empire from the start.
There are a few bits that lack polish, as I can't access the startpos.esf, the good parts of the database are largely inaccessible and I only edited the factions.loc text file.
If it garners enough support, I'll expand on the idea
.
Here are some screenshots:
As usual, just extract the .pack from the .rar file and drop it in Shogun 2's data folder.
Here's the default file path for the data folder:
C:\Program Files (x86)\Steam\steamapps\common\total war shogun 2\data
OR
C:\Program Files\Steam\steamapps\common\total war shogun 2\data
Enjoy
!