it's kosovo's armature, I decided to give him hinges in his knees and ankles because he needs to run, jump, fall and climb over the course of the film.
it's essentially a wire armature, with a home-made 1 plane hinge in the knees. bones made from electrical connector blocks with the plastic cut off, and of course, milliput.
photo taken from above, while the armature is raised on rigging so that the milliput doesn't get squashed while it dries.
