I actually am of Latvian descent on my father's side, hence the icon. I've never been there long, though, I only stayed there for a month and even then, 2 weeks were spent touring Eastern and Central Europe.
Still, I know my fair share about the provinces and could help just a tiny bit there. I'd certainly like to test it out, your mod looks very unique.
Once you get done, which I imagine won't be for a while, you plan on converting it to IN?
Oh yes, I know a lot of Lithuania too. Those pesky Lithuanians. We make fun of them and blame them for everything.