That vids been around for a while now. For a snow only application I don't think I would bother with an AF conversion into any chassis. The alu framed WR and YZ are a pita to work on your carb compared to a CR500 steely. There isn't a lot of weight savings to be had with an AF conversion. On the other hand if I was building a bike to ride on it's wheels I'd do it in a heartbeat for the suspension and geometry improvements.