 For the SE5 Crosthwaite and his team designed a completely different chassis frame, revised and improved suspension, new and relocated fuel tank, a rollover bar, new cooling system, spare wheel mounted in the nose to give increased rear space and a 17-gallon fuel tank.The car had separate folding rear seats and later a rear windscreen wiper, both firsts.When designing the chassis Crosthwaite worked closely with Ogle body stylist Peter Bailey to modify and refine the prototype.