RE: USOM Scratch Build
Mike,
plans for the AU Class do not exist. The hull is the old Sydney to Hobart Race maxi-yacht - Nicorette. Took years to develop mold.
Mylar I use Mylar because it's easy to work with and cheap. Here I buy it for $7 /metre. Ripstop costs approx. $29 /m. To find I did a quick Google search of Stationary / Drafting Supply companies in my area. Found largest supplier of drafting equipment and then checked products - tracing film. Company I found called Draftex. But that's here in Oz. I know you can buy Mylar in Yankland. I've read posts in RCGroups who mention suppliers for mail order in States and Canada.
But then again Ripstop is probably that much better for sails.
Here are some pretty pics of my first USOM Mistral sailing. I've built 5.
Larry.