Triple J came with a Sunbrella top from the factory, and it’s my understanding that the outfit who manufactured the tops for C-dory can make one for most all C-dory models. Hopefully someone here will have a contact number.
Last winter Triple J was stored at my in-laws house, an intensely wet location not far from Seattle; the boat stayed as dry as a bone.
You can see how it looks in my album.
The initial cost is high but I’m told by my upholstery friend there is no better material on the market. He said you just have to apply this special spray every few years to maintain its waterproof integrity.