In selecting the basic shape of the vehicle, Schlör chose two aircraft wing profiles that offered particularly low air resistance. To ensure that this favourable aerodynamic form was disturbed as little as possible, the body was extended outward as far as possible to enable the front wheels to turn within the body of the vehicle. As a consequence, the vehicle had a width of 2.10 metres. The engineers accepted that this width would produce a slightly greater drag. The floor of the vehicle was smooth, while the windows were installed flush with the outer shell.