Abstract: The soundbox body is a one piece plastic molding having an offset bottom concave-convex substantially parabolic sound reflector area joined by a reinforcing rib structure to the wall of the body. A top panel is mounted on a supporting and reinforcing frame attached to the upper edges of the body wall. A neck molded from lightweight plastic has lightweight metal reinforcement extending longitudinally therein. An attachment heel structure on the neck is received and secured in a complementary socket in the upper bout of the soundbox body. Tuning gear is housed in complementary bearing recesses formed complementally in a head panel on the neck and a head plate removably secured to the head panel, and providing bearing holes through which tuning posts extend for attachment of the tuning ends of the playing strings which extend therefrom over an adjustable nut and spaced over the finger board, and then across a sound hole bordered by a ring member locating a pick guard.