This looks awesome AlienQuark. I love the design of him.
The animation's looking good too, I feel the legs could use some subtle movement. Possibly just a simple up/down bob bending at the knees.
The animation loop is pretty obvious, but it still looks quite natural, given the restrictions.
With the back arm, I feel it looks pretty awkward compared to the other two. I'd add a slight bend in the elbow and wrist like the one in front.