Right hand:
Two modified CWGG-HLR-ALX hand-held large rocket launchers stuck together to a simple steel plate connected by struts
Right Back:
Two modified CWM-M36-4 missile launchers stuck together each unit fires 6 mediun missles(in game it can only launch 4 despite there being 6 places to launch)
Left back:
Two modified Crest CWC-GNL-15 'grenade launchers' stuck together modified with more ammo and with a muzzle break to reduce recoil
All hand drawn proportions are wacky though.
I'll add more as the story goes on.