3d robotic hand model

3d model of human hand that can be printed in pieces for assembly later. The hand should have full articulating fingers, space in the palm for 5 servos, one for each finger and a way to link each joint to a servo using steel rods, to mimic human finger movements. The design should be simple and assembly to be done by a 12 year old. No small pieces, use steel screws and nuts to join each joint