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I use a straightedge and cut straight lines just at the points of the outside edges.
I don't usually use a pen to trace around a fin pattern. Ink can show or "bleed" through a final paint color.
I used a pen to illustrate how I cut out the fins.
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There are six fins in total.
Two at a time are pinned together for shaping. Before pinning, I square up the root edges. The front and rear of the fins should be "close" to flush.
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The wider concave "dips" were sanded with the rounded side of my wooden sanding block.
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