Interesting story. As an NWT resident who has driven most of that route, I would have to say that the Smart car would not be my first choice for the trip. That they all made it was fairly impressive, even considering the 'off road' adventures that some of you had.
My only other comment is that your spending all of that time driving up there, and not spending a day to look around, or even better drive the 'ice road truckers' winter road route up to Tuktoyaktuk (about 3 hr each way), was a shame. Since you went to the effort to drive the road, it would have been nice to see what was there before you leave.