You can get shaper cutters for making the cove and bead, they may be a special order item and relative to router-bits, quite a bit more expensive. However, they would probably do a more consistently good job given their larger swing diameter.

Several people have built the straight 6% enlarge Guillemot. While I did tweek the design somewhat when I did it to make the Guillemot "L", the differences are minor. The biggest difference is my plans have 12" form spacing where you would need 12.72" spacing. Not a big deal.