So this was sort of a joke at first, but now it's turned into an actual project.
I just bought some old snowmobile skis on eBay and I'm going to rig up on some sort of mounting system, probably using those old cat box holes underneath for part of it.. I don't like the bolting idea in the BMW video and would want a way to quick release them and fold them up for when it's not snowing but if it happens to be clear in the morning and then dumps in the afternoon, all i'd have to do is pull 2 pins drop them down, put the pins back in and presto.
Oh, and running darkside, I'll have to pick up a chain. Found a place that sells them individually instead of in pairs and a single chain is small enough to fit under the seat. SWEET!