Okay, let me take a stab at something.
Prominently featured on the body is the scarab. The scarab is associated with the Egyptian god of the sun Khepri, who is an aspect of Ra as the rising sun, and is symbolic of renewal of life, creation, development, growth and effectiveness. Extremely popular as an amulet and funerary adornment.
The two gods are Horus and Anubis (who may have been brothers.) Horus is the god of the Sun, who was later incorporated into Ra. The right eye of Horus is depicted, which is the sun or morning star, also associated with Ra. Anubis is the protector and guide of the dead and god of the afterlife, as well as the patron god of lost souls.
The eye in the center of the guitar is the Eye of Horus, a symbol of protection, power, safety and good health. Again, it is Horus's right eye, also called the Eye of Ra. Often painted on ships for safe journey.
The ankh is the symbol of life.
So the symbolism of the guitar is such that it implores for, among other things, protection and a safe journey, with a nod to the protector of souls in case you tank.