Starting with a 1960 Harley-Davidson "Panhead" engine and trans, an earlier springer fork and a wide range of sprockets, gears and pulleys plus yards of steel stock, this track-type snow machine came to be. The photos speak to its complexity and probably its weight.
But the track seems wide and stout, the three runners supportive, the motor plenty torquey, so it's likely a pretty good performer. The amount of force required to steer probably brought about the worm gear steering box and steering wheel. No doubt some time with a torch or arc welder kept the builder warm. Maybe it was used to bring in firewood, or maybe it was just a fun machine that evolved over years through addition and modification.