Great work guys and really this mod looks promising but it will be tricky to represent many faction through all the time period of the mod. factions like Georgia and Armenia and Nubian factions where very minor while factions like mongol and khawarizmians were major world powers so if u go by balancing troops from 1212 to med 15c then armor and weapon damage points would be rly rly too much
though a heavy hit from a mace or poleaxe to the head even to fully plated soldier will kill him or at least knock him down unconscious and will be hard to balance so I suggest u to divide all units roster into three major eras to replace the older era troops recruitment and that will make balancing troops much more easier for u and even more realistic in evolving arms and armor and military tactics through time.
*Also factions like Scotland, Armenia an Nubian factions have less quality arms and armor than the others around them and smaller regular troops or have lack in certain type of units historically at their starting are, however if faction like Nubia were able to push Ayyubids out of Egypt won't their army improve.For example Nubia roster will be
*so I suggest all factions will be divided into categorizes based how many cities it holds not imperial level.
[ Minor faction --(varies from faction to faction)--> standard faction <=25=> major faction <=45=> Empire ]
*once a minor faction becomes standard they will remain that way and won't lose their new unlocked units or upgraded units
*slandered faction need to hold 25 city to unlock it's new units or upgrades
*major faction will lose the new unlocked units if the cities under their control is less than 25 but won't lose the new upgraded units
*major faction will need to hold 45 city to unlock their last new units and upgraded units
* if Em pier faction no longer hold 45 city or more they will lose their last new units but not the new upgraded units
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those are my suggestion to this mod thought not sure if those even possible to be scripted or implemented in the game but best of luck nevertheless