We hikes part of the Kettle Moraine North Unit in Wisconsin several years back and they have similar structures except the forth wall is partially built, about a 1/4 wall on each side with a large opening in the center. The first night was pleasent and the adults slept under the stars. The next night a huge thunderstorm moved in and we all slept in the shelter. But we brought a few plastic tarps and rigged them up as drapes in front of the opening to keep us dry from wind blown rain. It was early spring so the temp dropped too, but not freezing. After watching a fantastic lightning display from under the eaves, we all turned in for comfortable, safe evening.
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Willie Vannerson
McHenry, IL