That looks very nice Frederic. The blue looks pretty close based on the photos. I have two suggestions for your consideration.
1) I think that you might wish to consider rounding the sharp corners as it will be much easier on your pockets.
2) Rather than paint, you might consider the process of fired enamel. The process is called cloisonné and I expect there would be some craftsperson or jewelry maker local to you who may be able to do it. It is a very durable process which was used on the original front grille emblems.
Mark
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