I won't use Battletech rules (I don't like them), but I'll use the background and the weapon's terminology to convert it to be played with another set of rules. As those are in 15mm those bigger Mechs come in handy. The rules I'll be using are generic, so you can use any Sci-Fi background universe. Play with miniatures of any scale or background. I chose BT, because I always loved the Mecha stuff from Japan.