https://mech.nav-alpha.com/#bc257e45_COR-6R Simple brawler with an additional SNPPC for increased alpha strike. Due to the loadout it looks like a Fafnir, but with a SNPPC instead of an ECM. It looks like the right arm it could be used as a shield. If not, drop arm's armor and fit a bigger engine. Due to the fact it should be a very cool brawler, skillwise I suggest to max cooldown and survival: heat gen is not mandatory, operations can be completely ignored.
And here's an AMS version if you want the ability to simply deny the existence of most indirect LRMs now. https://mech.nav-alpha.com/#00c32314_COR-6R Shielding with an arm with a ton of ammo is less than ideal, but it should be the second bucket used so hopefully its used quick enough.