Yes, Don C. is a great modeler...does beautiful work. I'm familiar with NZ The Vintage Aviator site...shows good detail, but it's a little too 'clean' for me and I think WWI subjects show better when they are brush finished (which mine is). Not familiar with the Tamiya paint, but if it gives you a fairly fine sand paper finish, then it might be a suitable primer to use before coloring, etc. What I successfully tried and tested, were micro balloons mixed with household white latex paint primer. After finding the 'right' consistency, brushed it on a sample piece of exhaust material, let it dry, and then painted it just to see how it looked. Worked well. With regard to the full size a/c's metal surfaces, I've used litho plate everywhere metal is used on the full size a/c. Then, of course, had to do lots rivet counting, embossing , etc.
Like yours, it's added to the overall looks.