Star Frontiers: BattleTech
At one point in time, I spontaneously bought a boxed set of the original Battletech rules. At that time, I was completely engulfed in Star Frontiers, so my first instinct was to integrate it into SF. Why? I don’t know. I am not sure what I was thinking when I did it, but I did. These are by no means perfect. They are just something I decided to throw together, with thoughts of doing a campaign centered on a world torn by war between fighting factions, using ‘mechs.
Keep in mind that this was done before I had a copy of Tanks A Lot, so I created my own armor system for vehicles. It uses a IPV (Initial Penetration Value) as the Amount of damage required to penetrate the ‘mech armor and do internals. Along with that is the Structural Points of the Armor in that location, which are reduced every time the location is hit. These values may seem low to some people, but I scaled thgem for purposes of my campaign.