I'm still hammering things out, but I've got the system down. The game system I have in mind works on skills, the more of them you have that help in a given situation, the easier the roll. I modify the system so that skills are associated with various mech-parts. Such as a rifle-type weapon giving you a 'Medium Range' skill or somesuch. The setting is a future earth, where all the various nations become demilitarized, and rely on groups of small PMC's (You guys) to wage war.