I saw that one, or one just like it, in North Van last summer. Re awnings I just called one of the local rv repair places here on the south island and they sell a 16' length of awning rail for around 25 bucks. I think the profile is something like this
http://catalog.cmtrailers.com/ItemForm. ... 6b9ab6f01a
Vinyl welting is a buck or so a foot. This is the low tech approach. (The welting would be sown to a tarp and it's this end that is fed through the rail.) I saw a westy the other day using two shorter lengths of around 4' each, mounted end-to-end and angled away from each other to create a peak. This is on my project list.
--T