Dutton at one point was the largest kit car company in the world, they sold 6000 super 7 clone cars, more then anyone except Caterham, (there has been 150 companies that have built super 7 clones/reproductions), partly because of good pricing and they financed, 25% down, balance over 2 tears. Lotus only sold 2500 super 7's, Caterham has sold 13,000. The Cobra is the most copied design in history, the super 7 is number 2. Dutton is the oldest car company in the world with the same original owner, they are still in business, they only manufacture amphibious vehicles now, they are the only profitable amphibious vehicle manufacturer in the world. The Dutton super 7 clone has a steel tube frame, Triumph Spitfire front suspension, Ford Escort rear suspension, used mainly Ford drive trains, the lotus super 7 was built almost the same, the Duttons were over-engineered, they were strong, cheap and fast, good qualities, they are still used in Britain for racing and trialing, sometimes instead of breaking a real Lotus 7, (used lotus 7 $60,000). Someone said Duttons are becoming cult cars. The quickest kit car in the world is a Dutton Phaeton, it has a 434 c.i. Chev small block V8, it ran an 8.90 1/4 mile.