I am thinking of bashing together a set of replacement arms for Astrotrain. The need to fit into the sides without changing the appearance of the alt modes, so I would be using the same shoulder and flat piece that is on the outside of the arm. Can anyone suggest a bot that has slide-out arms and possibly pull/flip out hands, that would be able to be fitted to Astrotrain? Elbow movement would be a great bonus but is not absolutely necessary. So far, I am thinking G1 Swoop arms would be the easiest to modify to Astrotrain.