welcome to the club
I'd like to do the same, but I figure there's no way I'd ever match the original tambour, or the fake-walnut interior of the trailer. So unless I find junk parts, I'll wait 'till I do the whole enchilada.
(like that'll ever happen
hey, I can dream, right?).
meanwhile, here's what I've found:
Inland-Andy told me that he has some of the scrolls.
Airstream Innovations at Inland RV Center, Inc. (951) 734-8130
you can also get some stuff here:
http://www.outwater.com/catalog04/outwater/opi386.htm
I also found this, which helps explain how to install/remove and fix existing tambour:
http://www.silvertwinkie.com/tambour/index.html [on edit: link is broken 12-10-06]