Whelp, I saw that nobody gave suggesting this a try recently, so I thought I'd bring it up again.
This is basically a method that would allow players to seem like they're walking upside down and sideways. You mount it like the skis, or a vehicle. The model can be shoes, or their can be no model. when you move, it uses the walking animation, so it gives the illusion that you're just walking and not in a vehicle. And then it would work like the gravity jeep in that it would allow you to walk on walls and such. If you make this a vehicle rather than a "gravity playertype" then this becomes very possible as far as I know. This has been suggested several times before, but since it hasn't recently I thought I'd give it another try.