The Autotune designed chassis is a square section steel spaceframe, and when skinned in NS4 Aluminium makes an extremely rigid, lightweight structure. The square tubing used also helps to clearly differentiate it from original cars.
The front suspension features a fully rose jointed, double wishbone configuration using strong Jaguar uprights. At the rear twin radius arms, reversed lower wishbone and top link locate a purpose made cast alloy upright. Although designed by Autotune, the suspension geometry was checked and verified by former Chevron and Reynard designer Paul Brown, whose successful designs include F1, Indy, and Le Mans Cars.
The chassis was designed to accept the small block Chevrolet V8, but other V8s from Ford and the Oldsmobile/Buick/Rover have been used. Transaxle options range from the expensive race spec Hewland and ZF DS25, to the Porsche G50 and Renault UN1 road car units.
Two types of bodywork configuration are available, the narrow ‘B’ spec tail or winged ‘C’ spec tail.