A very common build nowadays, combining the power of 2 HLL with the constant fear of LMG crits. The heatsinks are based on personal preference, you can exchange them for a bigger Targeting Computer for example. The cLAP reduces target info time, which is great combined with skills and the targeting computer and makes you able to use your machine guns much more effectively. Also consider using the SHC-B left torso, which removes half of your machinegun power in favor of ECM. It also provides space and tonnage for a bigger targeting computer.
I've been running a similar build with less DHS and pulse lasers over Heavy Large. Not super happy with it, probably going to try this. Heavy larges seem to just have a lot more synergy with how often the shadowcat has to reposition.