Curve some pieces of sheet metal and panel bond in place inside the base. Then bondo and sand, prime, paint. Sure you'd be able to tell if you could see the inside but really no one would know but the car owner. With the hood open at a show or whatever it'd look like a normal stock part.
Option 2: cut circles and weld in place, grind to perfection. Labor intensive but possible.
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John Paige
Lab-14.com
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