Have you actually looked at the Sail mats in a paint program. It could be that  by applying one mat you get the full sails, and by applying another you get a mat and transmap, which would give the furled sails?

Just my 0.2p

It's certainly a very basic readme for such a complicated model.

The greatest part of wisdom is learning to develop  the ineffable genius of extracting the "neither here nor there" out of any situation...."