I think that the hood vent on the back might make this guy a bit back heavy, maybe if it were brought in a bit closer to the figure(?).
I really like the look of this though, good job man. Just think you could also add "wheel" shoulder pads to go with this
though that might get to be a bit much what w/ the gun things that attach to the arm. Still though, I really dig it and think this would look amazing w/ my basic upgrade added to it.
I love the head too and think this would be awesome hollowed out as a helmet ^__^