| There were two "chromates", the yellow one like you see done in the wheel wells of P47s and the green which you see on a bunch of other planes. It was used as an anti corrosive.
I've seen where soda can aluminum was used for really large scale models like the R/C size. For the rivet detail, you can take a length of really thin brass tubing, sharpen the edge of the tubing like an embossing tool to emboss the flush rivet detail. You have to do it before you install the panel onto the frame so you can get a good whack at it.
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