OK, my last build for this mech (I swear). Simple swap of the XL and SSRMs in the "Rover" for a STD and SRM6+As. Below is a variant with 2x SRM4+A in the arm with CAP and TC1 in CT (less 1 DHS).
I think you forgot to add the JJ! I would suggest giving cXL engine a go. Since this mech cannot zombie and clan engine can function with one side torso gone. That would allow for even bigger guns. Personally I think you have too much UAC10 ammo.