I wanted to go against what seems the norm with this build. All I see lately is people just making sure every single hardpoint is stuffed with weapons or making sure they have two A/C 20's. They don't seem to have any concern with heat.They just pop out and fire an alpha then hide for half a minute. That's fine and probably ends up being better with the current state of things because everyone else will be hiding and cooling off when you are cooling off. I didn't want that though, I wanted a build I could stay on someone and dish-out damage until they are dead. Also this build is many times more fun for that reason.
Orion ON1-K AKA: The Hunter
XL350
4xLL
22 double heatsinks
1.46 Heat Efficiency
The beauty of this is I only have 3 weapon groups; left click left arm, right click right arm, and side mouse button for chain fire. Another great aspect is the fact that I can fire at any range whenever I want (any range actually needed 90% of the time). I don't have to look at 5 different weapons and try to decide what range is best for what weapon or how much heat will this weapon give me. I know every time I can fire and how much heat I will get.
Not only is this more fun than any of the one click or mismatched weapon builds but within a few hours I was left with my highest damage game yet and my first time breaking 800:

Is it the most competitive build, absolutely not. Is it great when you want something simple and fun to play without a lot of thinking, definitely.