The top of the fuel tank is represented in the kit, though the rest of it would probably not be visible at the front of the finished cockpit.
The pilot’s seat comes with a separate cushion complete with wrinkles that will look good with careful painting, perhaps using oil paints to represent the leather.
Returning to the outside of the aircraft, there are three choices of airscrew provided though only two are used in the kit.
There is no etched brass hub for the airscrew as seen on some other kits of First World War aircraft, but I think that the moulded detail as provided is more than adequate and will look good with careful painting.
The Dr.1 was powered by the Oberursel Ur.II, a clone of the Le Rhône 9J rotary engine. The engine provided in the kit is very well moulded with very fine cooling fins on the cylinders.
There are two parts provided for the front face of the engine, one for the Oberursel powered Dr.1 and the other is for Verner Voss’ F.1 (apparently Voss had swapped his Oberursel for a French Le Rhône). The tops of the cylinders are provided as separate parts.
I’m sure that this engine will look very good with careful painting with perhaps some washes and / or dry brushing to highlight the delicate raised detail. The only things that could be added as far as I can see are the ignition cables leading to the spark plugs at the top of each cylinder which could easily be made from fine wire.