Here is a little gubbins I used to "find" the holes when making my Mundo footboards. Being aluminun is wasn't as easy a giving it a rap to telegraph a mark into the plywood- although I have used and like that trick.
Essentially you take 2 strips of metal- in this case hacksaw blades- and bolt or rivet them together at one end. You then drill a hole through the the loose end. The lower hole gets a rivet or screw so that it "finds" the hole under your sheet metal. The top hole is above the sheet metal and marks the spot.
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