I am happy for all your Warhammers, but this thread needs more Marauders.
My Marauder building rules are the following:
I) A Marauder without a shoulder cannon is a sad Marauder.
II) A Marauder with asymmetric arms is a sad Marauder.
III) PPCs should be tried, but they still blow without quirks
Therefore none of the following builds are optimal in any sense, but my personal enjoyment of running a Marauder. Still good enough for the YOLO queue though, since PUGs lack the coordination to exploit the flaws in my builds.
MAD-3R
Radar Deprivation
Advanced Seismic
Gauss Cooldown
PPC Range
As close to a super-stock version as my Marauders come. Heavy quirking makes PPCs somewhat viable, though still nowhere near 'objectively good'. All in all this mech is accurate and tanky as hell, with obvious flaws in terms of alpha size, sustained dps and min range. . You need to find some balance of keeping your distance, without straying too far from the pack.
BOUNTY HUNTER II
Radar Deprivation
Advanced Seismic
Gauss Cooldown
MPL Range
My short range Marauder. Plays most similar to a normal MPL boat, just with tacked on Gauss Rifle. Accurate 51point alpha allows for decent peeking and trading. With its relatively good heat efficiency it can start and win slugfests with laser boats, though.