Overview and Purpose:
The general purpose  of TAC is to better represent fundamental aspects of armies and combat from the early medieval to high medieval ages. The current goals are to better represent: randomness and diversity of troop equipment and quality, influences of foreign cultures on armies and how they are managed, how the institutions of different cultures impacted their approach to warfare and army formation and composition, and better represent the historical cultures and kingdoms that our beloved Bannerlord factions are based on.
Bannerlord's equipment and troops seems to hint to setting analogous to the mid 11th to the late 12th centuries (based on the vlandian armors, presence of mamlukes, and Taleworld's statements intending the Khuzaits to be influenced by pre-mongolian turkic steppe tribes), stretching from Norman Sicily and Tunisia to the Crimean Steppe and Egypt.
This was a time where a leader's control over the quality and type of troop was limited, and most soldiers on campaign were responsible for their own equipment. These could broadly be (over)simplified into four classes of Troops depending on individual wealth and access to equipment Levies/Poorer Freemen, Burghers/Professional Troops and mercenaries/Wealthier Freemen/Lesser Landed Nobles, Professional landed nobles with a state stipend and their retinues (either from the ruler's coffers or rights to the income of a land or industry), and foreign contingents, either as mercenaries or offered in context of diplomatic dealings.

Requirements:
Adonnay's Troop Changer

Current Features:

The Troops:
TAC's keeps the differences between equipment between across social and economic station in mind- each faction has at least one troop tree to represent each economic class (most have many, many more). However, bearing in mind the lack of control of equipment, the amount of horizontal movement between troop types is limited: rather than recruiting a general 'recruit', and training him into a pikeman or horse archer, you will instead recruit an archer, horseman, or spearman and they will upgrade into a better archer, horseman, and spearman, with some exceptions.
Different cultures have different ratios of Levies/Professionals/Nobles, and different ratios of those that will spawn as Archers/Infantry/Cavalry depending on each culture's conception of how warfare is waged.

Minor Factions: Minor Factions now have two linear troop trees: A standard "Professional" tree and a "Noble" tree, like the rest of each faction. Their equipment and skills have also been upgraded to be the same level as main faction troops. In the future, they will be recruitable from taverns.
Next Steps:

Current Update: Second Mercenary Overhaul

Next Planned Update: Second Minor Faction Overhaul

Future plans:

Adjusting the spawn rates to be more levy and infantry-heavy
Second Auxiliary Overhaul

Future plan (these will all be separate files)
Open Source Armory Patch
Bannerkings Patch
Bannerkings Expanded Cultures version (Because I'm a lunatic, and why shouldn't I just create a half dozen more troop trees for a bunch of new cultures?)