Only Buildable on the C as you need the arm mounted Missile hardpoints but can use base pack omnipods (Prime or A) for the torsos. Tweak ammo to fit your playstyle.
I'm really liking builds that use cSRMs with this mech. With it's speed and armor you can get in real close to splat someone. Here is one that I have been playing around with. It runs hot but has been fun.
I usually find SRMs that are mounted on the torso easier to aim, than the ones on the arms. It's not to bad when I don't group arm mounted weapons with torso mounted ones. This setup I've been placing the arm mounted SRMs in their own weapon grouping. I then create a separate weapon group for the torso mounted SRM with the small lasers. That seems to help me manage things a bit easier while in game.
Yeah I've found the shoulder and torso srm 4's superb for aiming but the arm ones are a right pain as they're significantly lower.