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Looks good John and nice save. I've done that before on a finish-painted surface.
... But the picture of the crashed 1408 seems to indicate something in that hole in the spinner. It looks too big to be a cannon barrel... some sort of tube or sleeve?
Excellent start John and good detail.
With my Eduard kit I glued the painted exhausts on the engine block before enclosing within the fuselage, I found that these exhausts fit so snugly it was not possible to attach later. So I built the engine, doing all the detail, including engine mounts and exhausts. This was then attached to the gun platform. At this stage I had already closed up the cockpit part but not glued the engine housing (the nose bits). I was then able on a number of occasions able to delicately manoeuvre the whole engine, exhaust and gun platform into place to get a good fit.
For spaying, I did some delicate masking.
Edit: We just crossed posts.
John, the repair on the spill on my P-40 was done by sanding and repainting the area.
For the conical piece on the end of your gun barrel, consider chopping off the short-shot piece and replacing it with a conical piece of stretched sprue. You can get the right shape from near the end of the stretched section where it tapers into the unmelted sprue. Pnce glued onto the barrel with CA, you can drill out the end.
That spinner back plate is very possibly black, with the lighting and contrast making it appear lighter. However, if it is a different colour, then I'd go for the original factory finish of RLM 70.