I had one about 10 years ago, good size, had a table on each end that folded down to a 3X7 bed, stove, furnace, and ice box. What we did is set it up, removed the canvas, put 2X4's in corners around the door, then closed it in with plywood. It worked great, just like a camp in the middle of the lake. The only problem was waiting for the ice to get thickenough to haul it out, then dealing with deep snow and slush when getting it off.