I'd like to introduce you to BanjoMan.
Slider controls rotate the whole character with respect to XYZ about the orgin (theta, phi, psi).
Slider controls set the banjo head diameter ("pot"), length of neck, head, and legs.
The legs have the same angular degrees of freedom as one expects for a "person-type" leg.
Provide the character with arms, hands, banjo strings, and some more personality.
Improve the foot instead of the box that is in place now.
Resolve the axis notations.