[@Shovel] So when I said you may fight the odd mech I mean that you may fight the odd mech. It wont be often and most of your efforts will be against infantry and light/medium vehicles. I want mechs to be more of the big stompy titans in the background that sometimes blow up the building your standing near. For the most part your steering well clear. If you absolutely had to go toe to toe with a mech it's not like i'm going to make it an atlas. Besides Light mechs don't always beat vehicles, It really depends on the vehicle as there are a good number of tanks that could easily shred a locust or a commando in this setting. 

As for how you guys would fight them. Well all i'll say is you'll have to get creative. Or just run like hell.