Ooooh. Soft pins. I like this idea.
Maybe even lead pins? Just for ease?
I think I'm liking this Filibuster's ideas. Personally, to our creative friend Mr. Hewitt, I would advise ignoring my grandiose ideas for bullet hardness; I was rambling, and such matters seldom or never come up in anime, even mecha anime. In the instances they do, the manner in which it occurs can be replicated by having very high armor ratings with very low item damage points to represent an object that is hard to scratch but essentially brittle.
I think your system works better than the one I was talking about, for purposes of an anime-based game. If, however, I was looking to recreate a Cyberstorm-esque game, with incredible amounts of targetting data, damage placement, armor vs. weapon, type vs. type, and pilot health and stability and all that under the hood, I might throw in weapon hardness.
It's just too unlikely a mechanic in an anime.
