Hi - we're hoping to convert our backyard play shed into a coop. The plywood is in good condition but there are sizable gaps between the pieces. We're in Mass, so trying to figure out the best / most efficient way to get this snug & weatherproof for the winter, outside of covering each side with a big solid piece of plywood or nailing little strips of wood. . Was thinking maybe lining it with plastic construction tarp? Any thoughts or similar experiences would be great! This is our first time making a coop. Thanks!