In 1963, Garrie Cooper began work on a revolutionary monocoque design of a car intended to dominate the newly created Australian 1½ Litre capacity class.

The monocoque build removed the need for the traditional "Superleggera" tube frame chassis and harnessed a very light sheet steel frame to which aluminum panels were riveted for a very stiff structure.

The finished structure weighed approximately 80 kg less than the tube framed Elfin Catalina it replaced.

Uniquely, the hollow section of the body was sealed off to serve as the petrol tank.

The Elfin Mono eventually made its debut at the August 1964 Melbourne Racing Car show and orders quickly followed.