Looks like the 'pocket' model of the toboggans built by Wayland and other members for arctic haulage.
I would imagine the side walls would stiffen the shape which is opposite to the advantage of the Toboggan.
The flex in the length improves it's performance dramatically.
Really nice ideas when you have no plans to get serious about winter travel.
Study these:
http://iditarod.com/
The last great race on this entire planet. Celebrates an historic event as well.