S-hook ready hands, wrist, forearm for robot doll

This is a design for making the forearms and wrist cuffs hollow for robot ball jointed doll so elastic may pass through and hands ready to be connected via a pin and s-hook like real ball joined doll hands (coat hanger wire pins and s-hooks will need to be added to complete hands.) Gives more possibility of poses to doll and easier printability of model.
http://www.thingiverse.com/thing:614366

Files only contain left side, mirror to print the right sides and add supports in your preferred s