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Here's a new mod for building icons, along with a set of textures that I used – this is just in case you want to rework something (many of the textures are in PDN format, which can be opened in paint.net).
08/17/21
V1.1
The fort icons in the human city have been fixed; now the fort has the number 1, not 3, and the other forts have been fixed as well.
This bug comes from the game itself – the fort uses the castle icon, the citadel uses the fort icon, and the castle uses the citadel icon... it's very strange. There are also incorrectly numbered unit buildings, where witches are listed as level 5 and hydras as level 6 (the same goes for ents and unicorns). It's clear that at some point the levels changed, but the buildings only changed on the construction plan, but in the human fort, only the icons were changed; there was no change in the buildings themselves.