The Leopard was a twin-jet, mid-wing monoplane of composite construction with all-swept flying surfaces and jet fighter-like styling, apart from the podded engines, mounted on each side of the rear fuselage.

Development suffered a major setback when the engine manufacturer, Noel Penny Turbines, ceased business, leading to the grounding of the prototype.

This aircraft also incorporated a pressurised cabin, revised undercarriage, and a generally strengthened airframe.

The EJ22 engine could no longer be used due to exclusive deal between Williams and Eclipse,[4] resulting in the Six being proposed to make use of the larger FJ33.

Chief aircraft designer and CMC chairman Ian Chichester-Miles died in 2009, bringing the enterprise to an end.