Did this guy a while back, the trick was getting him balanced on that fist. Bit of note: For some reason when they put this guy together his hand that is flung back is upside down from the concept art. When I sculpted it the palm was pointed down so I was surprised when I saw the finished pictures that they assembled him that way. I didn't even know it could do that.
Pictures provided by Privateer Press, painting by Privateer Press painting team