Well, I'm basing this off RTW, but in that game there was a file down in the data folder called export_descr_unit.txt, which contained the specifics on every unit in the game. It had weapon stats, amount of ammo carried, attack rating, armor rating and type (flesh, leather, metal - metal gave penalties in desert), defensive skills and so forth. So it's very easy to go in, find the line for Spanish Pikemen (or whatever the game file refers to Tercio Pikemen as ) and change their armor from "0, flesh" to "3, flesh" and let the game engine take care of the upgrades from there. However, in the corresponding file for buildings, I don't recall there being a way to modify the amount of armor that could be given.
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