I gave some thought to that. I have countersunk the sheet metal so that the screws (or rivet heads) sit flush; a tiny dab of black silicone caulk should hide them. They are in a low visibility area, and an air dam should help hide them too. I'll put up some pics in my resto thread, so others can see how it came out, and decide for themselves if they want to use such a method.
I did see David's idea, but hadn't thought of using it in this way.
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