Hi Dave,

I understand the point of the mast measurement but when you have two sails you can see which one is the flatter one and can make a choise that one of the 2 sails is best for you and than you can let try a sailmaker to copy this sail but this is still difficult. The point about the mast is that it is a pretty old mast and it is not to compare anymore with todays masts but what the cheapest way of doing is buy a sail of 1 year old and give it a shot.
The point about the bending is that everybody is doing this different so this is always a problem but a good sailmaker should do the job.
Otherwise look at the A-class IACA website or contact us at info@catamaranparts.nl maybe we can help you, we are doing the A-class and Blade F16 in Europe.

Regards,
Hans