Drop lots of armor, limited ammo, but this baby will jump high and fast with 5x Class IV JJs! 30 Gauss shots paired with cERPPs is a potential of 900+ damage. The smallest mech that theoretically can make this build work. Obviously it cannot engage directly with it's very limited armor, but it might be able to trade well from behind cover.
Had quite a few games where I've survived like this.
NVA-B "Thin-Crust Strudel" (1x Gauss, 1x erPPC)