I've made a few of these, though but by no means am I an expert.
Here's my 2 cents-
I would recommend making a wide flat bottom (you need this to stay on top of fluffy snow) with angled sides (not vertical sides, which dig into the snow and make it tip over). Tipping over isn't terrible but it means you have to walk across smooth snow which ruins the driving surface. There is a balance which I have not yet found on the height of the bow. Too low and it will dig into the snow, and too high and it will catch air and flip over backwards at any sort of high speeds you will be reaching with super bee motors. Use packing tape on the bottom, even for the first test because hidden sticks will ruin the foam. Also, a mistake I have made was not waterproofing electronics. This is not necessary if you make seperate partitions for the receiver and esc away from the battery. I often get snow inside the vehicle when plugging in the battery, or when moving it around to change the center of gravity. The snow then melts quickly on the warm esc. You do not need to waterproof the servos (if you even have physical rudders) unless you expect this boat/skimmer will still be around in the summer to drive on a pond, lake, or pool.
Try to keep the thrust line as low as possible (no up or down angle though). Basically just mount the motors so the props just barely clear the deck. This will lower the risk of digging into the snow or flipping over.
Just my thoughts- Please post in here if you figure out how to minimize flips, too, because I never know how to stop them other than slowing down which is no fun.
PS: Can we see some pictures when you have some finished so we can get some inspiration for winter projects?
PPS: jumps only sometimes work if you cut the motor in midair. If you give throttle it will pile drive into the ground. (trying to help save a couple sticks of hot glue)