I think it would be very very good and proffensional if you made new icons of buildings. Not just a few new and keep some old ones.
Make new building icons for every building, like in Invasio Barbarorum mod. link: https://forums.totalwar.org/vb/showthread.php?t=88279
It makes everything feel much better and shows that there is a very good system, and does very much to the game.
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