In February 1980, a bare body was delivered to the Marreau brothers, and the pair set out to cut, strengthen and weld their ideal car ready for the 1981 edition of the race. The front suspension remained standard, but a Renault Trafic body bottom was grafted to the rear. The exhaust emerged spectacularly from the front bonnet and ran along the windscreen and then the roof. Other modifications included the removal of the rear bench seat to be replaced by a 200 litre petrol tank that supplied a 1,565 cc Renault 18 turbo engine, that offered 110 hp and connected to a modified five-speed gear box, also serving to adapt it to 4X4 conditions.