Actually got this in an email from my grandpa earlier today, and it seemed really cool!
The video certainly makes it seem to work well. And I liked the emphasis on the reusability of the existing vehicle. Still, I have to wonder how strong and easy to replace/fix those drums would be. Not to mention how well it performs outside video-conditions. It didn't look like it in the video, but I also wonder about whether it gets stuck when stopped because it sinks into the snow too much...
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