@Shug: the velcro sure does look cozy, but for my uses would be unnecessary. I meant to ask you though, if you've ever done any hiking (winter or otherwise) in the Agawa canyon near Sault St. Marie? I noticed that you're not too far away from some of the Canadian attractions, and it's stunning! My cousin does a lot of ice climbing there, and said the winter camping in the area can be phenomenal! A great place to put those velcro closures through their paces. http://en.wikipedia.org/wiki/Agawa_Canyon
@sky: I would love to see pictures of that when you get it setup for the first time! A custom cuben tarp, sounds like a dream!