do a search for urethane coated ripstop nylon. You'll find a load of
entries for good $$. There's other waterproofing options as well.
Just remember to STUFF the fabric instead of folding it when stowing.
It will crack and leak on the folds eventually.

If you design it, pls think about adding the pattern to the Vanagon
Wiki as this is the same dream project that Kris and I've talked about.

john

>>  Is anybody familiar with this "Sport Nylon"
>> product and
>> do you think it would work?