Must.. post.. every.. possible... build... before mech is released... Possibly tweak JJs and armour for moar engine. SSRMs can probably be replaced with SRMs once they get nerfed back into reality land... or if you prefer to roll that way:
Well, after some testing I can say that "Mr. Brawly" is very survivable. I found it a little slow though, and ended up moving to a 325XL to make it more of a "Mr. Light Hunty". I'll try the Std version again when I get Elites done and see how it goes. This thing is great as a "designated squirrel chaser". It shreds lights, but struggles a bit against fully-armoured heavies. I've found the trick is to hunt lights around the fringes at the start of the game, and then move into the brawl later once the enemies have lost some armour. At this point you can clean up with the MGs and LPLas. It generally survives well in the brawl; the XL is no great liability, and the MGs and streaks seem to blind/panic a lot of enemies, especially when they have exposed components. Current XL version: AMS can be dropped to go to a 340XL, which I would probably do if I had the C-bills for it...
