Hey all!
I'm actually working on a presentation today (still in law school until December, after all) so I won't be too responsive until tomorrow, but I wanted to offer some updates.
On the fire bowl thickness: this is actually still in flux to some degree. In its thinnest possible iteration (what I've been using on my prototype), it's been fine through 100s of boils. The heating soft tempers the Al (so don't bang it against a rock to remove ashes), but the time it's expose to these temperatures is relatively short under normal use. Physically, you'll notice some softening between boils 0 and 1, but I have noticed no appreciable difference between boils 1 and 100. The kettle does not experience the same changes because of the heat sink effect of the water.
On availability: the numbers on the site are quasi-real-time. I update them when I see that I have a new order.
Shipping to Canada: Most likely USPS. Unless I see a reason to do otherwise, USPS is the way I'm going all around, with a 3d party providing shipping insurance where necessary.
I can see that many of you have been recommending these to friends and other little virtual communities on the web. Thanks so much! It's humbling to have such support.
