[Varyon]

Obviously house-rule territory, but part of me feels allowing one to replace armor with infinitely-hardened, semi-ablative armor at no charge might not be inappropriate. Perhaps allow higher armor divisors to ablate it a bit faster, if you want the difference between rainbow laser and particle beam to matter; offhand, I'd say AD (2) to (3) removes 1 DR per 7 damage, (5) removes 1 DR per 5 damage, and (10) removes 1 DR per 3 damage, perhaps. That makes it easier to make your vehicles proof against their own attacks... for a few hits.