Great update! I personally like systems that take into account the types of armor and the weapons used against that armor. For example, slashing swords are more effective against leather/hide versus say plate armor. Whereas a crossbow bolt may be more effective against plate versus say chain armor. Things along those lines. I also like the ability to layer armor, such as chain worn under plate armor, etc. You could simplify this by simply creating multiple types of plate armor where one type already has chain under it, which would give a bonus versus slashing and piercing type weapons, but would be less effective against say bludgeoning weapons. Granted I am not an expert in armors, but these are just some things I think about. I could also see armor being "master worked" or something along those lines in which the bonus is not necessarily in the effectiveness of the armor, but possibly in that it is more mobile and "fitted" to the wearer. I like the idea of realism in the mechanics, but with the element of magic available to augment the mundane equipment, such as barrier spells or reactive enchantments.
