Head, torso, arms: Star Wars Droid
Waist: Gung Ho?
Legs: Cobra Trooper

The G.I.Joe M.U.L.E., Multifunction Utility Learning Equipment, is the Joe Team's answer to the Cobra B.A.T.s. Programmed using recorded data from the best-trained operators in the military, coupled with A.I. capable of learning, the M.U.L.E. is a force to reckon with on the battlefield.
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I copied this idea from another customizer years ago, changing certain things to make it more my own. I finally found the pics to post. It was a fun build.