 Other references use the MkII designation for a planned successor to the GT that would retain the mid-engine layout but be larger than the original car.Early design work was done by Peter Bohanna.When this project stalled, Bohanna partnered with Robin Stables to form "Bohanna Stables" and produced a mid-engined prototype called the Diablo that debuted at the 1972 London Racing Car Show and was later developed into the AC 3000ME.