I'm back after playing Stingz build for a few days! The thing about this build I noticed most strongly is how little heat over damage it produces. That gives me enough burst damage to core a Stalker from behind with all its CT back armor still on.
Other things I like to do is play chicken with other mechs. I'd go right in front of them when their CT armor is down or almost down, and I'd stand still and we'd shoot at each other until the other mech ineveitably overheats from spamming all its guns at once. (Note, doesn't work against other ballistics-heavy mechs. Keep moving!)
Anyway, your main targets in this build is still heavies and assaults, but with some precision aiming, you can leg a light or medium fairly easily as well.
Here are some highlights:

I didn't expect to still get 2nd place. Most of my kills were together with my team, but the last one was an epic 3v1 showdown. Went down guns blazing.

Officially beat my kill record here. I admit some kills were a kill steal, but still a pretty sweet run.

Most damage I've ever done with this K2. I don't expect myself to go past 1k damage as I tend to avoid brawls. Finding an opportunity to jump a straggler's much more effective.

Sometimes I wish I did premades, but 200+ms and no mic makes it a tad bit hard. (also, shy ._.)

This game was fairly even, but losing their lights early cost the other team. Don't run into an enemy blob without support, light mech pilots!
So yeah. This build was the most fun I've had in MWO so far. Simple, effective and just plain awesome. I think I've found my mech of choice.