I needed to go ahead and get a paddle and a spray skirt today, and I haven't seen anymore updates on the Kudzucraft store about Seal spray skirts, so I went to REI and got a Seals one from them. It turned out that a Seals size 2.2 'Sneak' works on my Curlew with plywood coaming. The fit seems nice and snug, but I haven't skinned my boat yet, so I can't provide any feedback on the water tightness of it.
-MucketyMuck