Good 'ol laser vomit. Change armor around as preferred. One thing I like about the PXH-1K and the -1B is that they have torso slots. The 1K is essentially a big Firestarter without jumpjets.
There are no engine crits in MW:O (yet). Putting the DHS in the arms would offer some minor advantage though (crit padding the MLas).
_ With this mech being gifted as an event mech, I'm planning on running this. Definitely recommend skilling into operations for heat management and cooling.