As you can see the panelling is moving forwards - all be it slowly. However, I had a bit of a dilemma with the floor panel. The instructions state it should go from the bottom of the rear bulkhead to the cross member just in front of the fuel tank. However, having stared at it for about 2 hrs, I can't think of a good reason why a). you would not go right to the front of the chassis, and b). why you wouldn't extend it into the engine bay (at least to cover the two triangle side sections of the chassis and the area just behind the rear bulk head.
I suspect both these areas would act a stone / mud collector, but they would almost certainly also improve the aero package, and to some extent keep the engine cleaner.
Anyway, for now, I have stuck with the instructions with the theory that I could always add the panels later.
Also, I've completed the rear bulk head panels: