I realized that I hadn't posted about this -- with guidance from a Cheasapeake Paddlers Association class, I made a custom neoprene spray skirt for my Shearwater Sport Sectional.  I finally got to take it out last weekend, and was very happy with how the skirt performed -- loved not having to fight to get it onto the boat.  

If anyone's interested, here are the instructions I followed: https://www.cpakayaker.com/wp-content/uploads/2020/03/Making-a-Spray-Skirt_Duane-Strosaker.pdf

Plywood has gotten more expensive these days, so I would be happy to loan the plywood jig to anyone else with a Shearwater Sport or Sport Sectional in the DC area...