Hotter but with more alpha. Should crack through armor faster opening up internals for crits. 2x LL make nice UAV swatters and assist grabbers and they are arm mounted to discourage lights.
Why not downgrade to MRM30, so you will have better heat efficiency, no ghostheat and max armor? Plus, with ammo skills, you will rarely run out of ammo. MRM will be worth 1080 (18 salvos, a little more than 1 minute non-stop) and LMG 6000 (1:40 minutes)
I found this build to be ineffective at long range and easily become overheated at close/medium range. Plus I struggle to use up even half of the ammo. But I do like the LMG+MRM idea. So my variation uses different energy weapons, drops some of the ammo and reclaims some armor. The ghost heat on the MRM40's isn't that bad. But I prefer to chainfire them anyway to manage heat. I also put the LMGs and ML into the same weapon group.
Agreed, it isn't too bad to alpha 2 MRM 40's. I ended up rolling with: ERLL is mostly for decoration. Harassment at long range, and/or for use only if you see a cherry red component. Skill tree for it: https://kitlaan.gitlab.io/mwoskill/?p=jsonbin1.59e6c88a7bc6df11da182b58#s=Weapons
