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Lay out the parabola on some 1/4" hardboard. Cut with the skill saw close to the line. Use rasps, files, and sandpaper to get it perfect.

Use the hardboard piece as a pattern and mark out your ribs. Cut the ribs close to the line, then clamp the pattern back on each rib and use a router with a guide bearing to trim the rib to the pattern.

Keep the pattern to use in the future.
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