I've got rid of the raised rivets on the wings but retained a subtle flush rivet effect. Most Spitfires had raised rivets on the rear fuselage so I've kept them there.
The photos showed a pale coloured exhaust stain which I copied on the skin. It doesn't show up too well on the screenshots but you can see it if you download the skin. I'll up the opacity a bit on it.
Thanks again for the feedback everyone.
