Machka,
After viewing your streets, I can't imagine doing centuries without a set course within site of civilization. I just completed RUSA's R12 and endured some cold (not sub zero fahrenheit) and some intense wind and rains. Without much riding to back my efforts, I am slower than my usual slow self. Also, Kent Peterson has used studded winter tires in really icy conditions. He may have done a permanent a year ago with these. Of course that requires room for larger tires which may not be available on your marinoni. That would be number one for cruising compact snow and ice. And then you only have to deal with the issue of frost bite. I can't imagine having to ride for hours on snow and ice. Heres to you if you determine to do this. !
J