Looks to me that the outer doors and sidepod covers are a separate part that aren't on there, the curvy shape is just the internal ducting. Sidepod coolers just behind the door that vent upwards right in front of the rear wheel were a common feature in early Group C/GTP designs.
The front fender cutout actually looks a lot like the 86G, but the tail and top surface of the fenders are quite different.
