Zortanius, the effort is commendable, but I am afraid it is futile. MTW is only reasonably historically accurate. Only heavy modding could improve it and even then you are stuck with things like skirmishers and horse archers not behaving correctly, simplified and bugged diplomacy and so fort. The list of 'historical' improvements I can think of is already very long, and I am by no means an historian.

There are several mods which have attempted historical accuracy. I can remember two: Blind King of Bohemia's supermedieval and kekvitrae's mod. But for this you should look in the engineers guild subforum of the dungeon.