I can whip up some hand top down views if need be, and I will make the back attachment unit if need be as well. I don't think it has to be too complex.
Lets try to give the indication of a servo motor discreetly placed on the back of the tricep. I think it will solve at least one pivot issue. Please note that I didn't do any work on the legs here.
I excluded the backpack at this juncture, since it is modular and subject to change.
Aaron, are the fingers and toes descriptive enough to model from? I can do close ups on the extremities if need be. Also I can do a back view of the head.