Julian yet again you do some remarkably fine work, these are very impressive.

Regarding Jonas comments on the shape of the sails, I wonder if you used a spherical shape and bent or hammered the brass sails around that, then maybe you could get the compound curves desired. You might need to recut the brass after the bending process and it would be a lot of work. I once took a flat piece of stainless steel and hammered it to get the compound shape of the bow of a modern sailing boat and it worked reasonably well, but my finish was quite crude.
Just a thought.

By the way the ratlines look superb.