Thank you 
In this way Tatars civ would already have several of their units and it would be enough to add new ones (focused on Turkic peoples).
Chinese civs in exchange for Mongol units (which if I remember correctly there are 4-5, mainly cavalry) would receive typically Chinese ones. The same would apply to the Chinese “Village”, their unique building House - it should also be replaced as it is very nomadic.
Tatars civ should have the ability to pack and relocate their buildings at the cost of their lower HP. Of course, they would also have expensive technology that makes them no longer Nomads - then they would gain an architecture similar to the Cental Asian Architecture Set from AoE 2.
Tatars civ (along with the Ottomans civ after second great rework of them) could be representatives of a completely new category of civs - Islamic Civilizations.