In fairness, if we were to do this over again I would vote OTC
+ Double Shoulder Harpoon + Drill
. But we decided to go the dakka route this time, so we should probably stick with guns and launchers. Given that we've built a relatively slow mech, snipers and long range artillery seem like a major threat, which is why I voted for the plasma gun. That 'Congo Hunter' enemy seems especially dangerous.