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I like Z-shaped metallic overlay. Shading is especially great on upper left Z-construction and area near it (and on lower right "wing" you could use more contrasting shades of grey for similar effect). "Roof" of vehicle is empty, but I think that it may be stylistic choice - it would be very easy to fill this blue area with different gadgets and panels. You can actually play with it if you imagine that on the underside it has different engines for vertical take off like those flying cars in Urashiman/Rock 'n Cop for example (FF>> to 4:30):
http://www.youtube.com/watch?v=OJnXuOQcDlM