In regards to the flags Look for inspiration on pint interest
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Can you use fan art of the major cities and capitals instead of generic stock footage of castles.
Please do not rush the mod it does not matter if its not finished by the end of this year, quality over quantity. We have waited for many years for a lotr mod if its going to be badly done with bad UI, broken diplomacy and no new immersive new government types it is not worth it.
Please put some thought into the kinds of governments you create