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I know it's a little late for you since you've already mounted your bimini, but your comment about drilling and finding no wood beneath the fiberglass prompted me to offer a tip to avoid that in the future.

Use a regular ol' stud finder to locate where the wood is. Get it calibrated in a place where there's not supposed to be any wood, then move it forward along the gunnel. You will be able to tell the beginning and end of each of the wood pieces. I marked them with a grease pencil when I was drilling some holes.

Works like a charm.