Meta and classic vomit laser is meta and classic. No need for introductions or explanations. Why this build and this warhammer? Because there are only 2 mechs capable to fit a full 3xLL + 6xML build (this one and the black knight 6B, which has a whopping -10% heat... TBF there is also the hunchback 4P, but good luck fitting 3xLL + 6xML on that mech). This build is hot, but has a nice +10% range (with maxed skills ERML will have an optimal range of 450 meters) and if you have good aim you can really melt down your enemies like clanners would do with HLLs ALT: LE version if you can't tank die like a man.
32% cooling efficiency is a no-go with current meta. After DHS buff patch minimum cooling efficiency sweet-spot for vomit laser builds shifted from 34% / 40% (bare minimum / very good cooling for a high alpha laser vomit) to 40% / 50%. Also, top dog has those atrocious hand actuators which prevents you to both fit and additional DHS per arm and fit better upgrades. TDR-5S-T Top Dog "The Pu(g)nisher" (3xLL, 4xERML, TC1, LE300) was the best I came up with, but I still prefer and use it with a 5xERLL fit due to very high hardpoints and lower weight compared to a warhammer
5/5, Solid IS laser vomit build. Because I'm a wuss I went with standard medium lasers instead of the ERML's, for better DPS in lieu of range. https://kitlaan.gitlab.io/mwoskill/?p=jsonbin1.5c3ff72e05d34b26f20b8957#s=Weapons Grasshopper 5H right now seems to be one of the top kings of IS laser vomit, but the WHM-6D can run it just fine.