Waiting for Ropi336’s mod update, I started modding my own Polish civilization several months ago.
It is very simple compared to the Eastern Europe Civilizations mod. I’m new to modding and it allowed me to practice.
There are very few new elements, I tried to take the game’s resources as much as possible (3D models, strings, icons…). I hope this will help the mod to survive through updates…
I’ll update the mod in the next few days. You can see the changes in this topic:
The update is online !
There are so many additions that it will be difficult to make a changelog.
But you can see a preview in the design thread I put above.
I also released an expansion that adds the Polish AI: Just Poland - Sobieski AI
I did this because this kind of mod is not compatible with other mods that add or modify AI. This is the case for some Civilization mods or even Age of Pirates.
Don’t hesitate to give us your feedback here !
The mod is incredible, thank you so much.
Now I think few stuff should be nerfed (but not a lot), the most obvious for me is the stable cost: it should be 250 wood. 1 normal stable + half a house is 250 wood. Plus it gives more advantages than a normal stable (natives upgrades). So I really think it would more balanced with a cost of 250 instead of 200. The other stuff is the amount of damages dealt by hetmans. I think it might be too much ? Maybe reduce it a bit as they already train units and bring bonuses to nearby units.
Ofc balancing is a hard topic on aoe3, so your mod is already incredible for what it is right now. Thank you again 
After several requests, I created a submod, which changes the flag and name of the Polish civilization to the Polish-Lithuanian commonwealth. Also adds Lithuanian voice lines to some units.
It’s “Not Just Poland - Commonwealth Submod”
@Prof624378 Thanks for your feedback! I also agree with certain points. We’ll see how we can improve this in a future update.