Greg,
This link, http://www.sailinganarchy.com/general/2003/cuben%20fiber.htm, gives you a little info about the sail cloth. Hey, I sail pretty much year round, do the odd race and am not overly concerned about rating, so why not experiment a little.

The tramp thing on the P19 has always been a negative about the boat. With the Tornado self-tacker, ALL the mess that was associated with the jib is gone. Even without going with this type of jib setup, you can get rid of most of the clutter. Just ask yourself...How often to you use the fore/aft or inboard/outboard adjustments? If not often, then you can probably get rid of most of what is on the tramp. Once I get everything put together, I'll get you a good pic of the tramp. Meanwhile I am attaching a rough pic to give you an idea of my progress with the tramp.

Dave