Charles that’s good quality information and paints a useful template for me to follow. As I am making a 1944 Spit (possibly MK923) I think I might be in the clear with the domed rivets. I have a CD with many images of MK923 somewhere from the museum of flight in Seattle. Time to dig it out me thinks. But then again I might want to have a go at the rivets!

Thanks for the pointer.