Took me a while to realize that the Heavyarms comes with two options of grasping hands. One is for holding melee weapons like a beam saber and the other is designed with a peg to fit the handles of the gatling gun. Didn't realize this and spent a good five minutes fiddling to get this shot.
It can also actually kneel pretty well without looking funky, despite the toes only bending downward and not "up." The bullet belt is really cubersome and limits what you can do with the gatling gun though...it also gets in the way of the left leg a lot.