Bit concerned about your traction on snow and ice. Do you have something for that?
No idea on the scientific merit of this, but local outdoorsman wisdom says that once you've frozen something, it'll freeze quicker, forever after. So if you've already had frostbite, be extra careful of those parts.
Two layers of VBL (aka breadbags), one on either side of the insulation layer, works well. I once walked a blizzard in sandals with that setup (long sad story). After dryness, wiggle room is most important, you've got that. Keep your legs warm, too. Hard to get warm blood at the far end of a cold leg.