Motion Pictures 1920's snowmobile "concept", check it out!

From the video you'd have to think it was an offical Fordson product. What're the drums made of? Steel, I guess. I've seen pictures of 20s snow crawlers on Model T chassis, with an extra rear axle and two tracks on the back and wood skis instead of front wheels. One was used around the Syracuse NY area by a doctor in the 20s. I've seen several pictures of that one. Might have been a truck chassis, my memory is hazy, truck or touring, it rode real high. Doctor Popsicle, at your service.