We'll collect responses from PiGu and Aj in this comment to make them easier for users to find.
PiGu
Yes indeed! A very unique and beautiful monument
Yes they do! They work just like any other special building, so they can be properly interacted with and constructed : )
Idea is to not spoil the surprise and let you find them freely for yourselves, but yes some of the monuments with their modifiers will be revealed in the Dev Diary on Tuesday ; )
There's definitely more information in Tuesday's Dev Diary on this, but generally speaking they make full use of existing modifiers and mechanics without trying to reinvent the wheel. I tried to mostly keep them in line with those from the base game, design-wise.
Of course!
Information from that region in that time period is quite difficult to find online, or anywhere really. The palace is an attempt at describing the palatial complex we know existed in the site of Koumbi Saleh, which is described in relatively contemporary written accounts. The Kano Earthworks are a system of fortifications that used to - and to some extent still - protect the wealthy city of Kano.
Aj
All Ugro-Permians will receive the Khanty aesthetic to my knowledge, maybe a few more. Sami one is restricted to Sami, possibly also Karelians
For what its worth, I'm also a professional 3D game artist outside of modding, which is still mostly a hobby, and a lot of the previous DLC and even vanilla artwork was done by external workers already.
Also, this is kinda silly imo because I wasn't ever intending on making any of this stuff for free to begin with. I only made it because I was hired, and besides something like Elder Kings 2 which is a long term project that I still work on, I would never make a mod of this high a scope lol. I don't have the free time for that kinda stuff.
Most of the clothing is anachronistic due to lack of earlier sources. Ultimately I preferred to make something accurate to the cultures than try to be inventive.
I'd certainly be open to it