I live in
Nova Scotia. I built a frame out of EMT (the metal pipe that
electric wires go thru for protection) had to bend to make it
work, a friend had a smaller boat same make, just copied the bends. purchased some nice fittings for the end to tie/bolt into the backbone, zip tie to the toe rail, use a large tarp to go over the whole thing. I also have a large piece of
fish net i hang over the tarp-strap to the
cradle. this holds the tarp from swinging in the
wind, no marks from grommets, i also put 2 X 20 lb bags of charcoal in the boat, open, keeps out moisture and those "over winter" smells that seem to come from no where. No issues, no water, no moisture and we have a lot of freeze thaws here with plenty of snow fall (last year
record snow fall). The one big plus is that i have about 3' crawl space to work on the deck and a small
electric heater in the
cabin will enable me to work without gloves or a jacket during even the coldest days. if you scrounge construction or destruction sites you can prob get the emt for free.