Used 2" x 4" welded wire for the framework. Wrapped a sheet of 1/8" bathroom shower panel. Wrapped that with a roll of insulation and then the tar paper. Top of container has 2 -1/2" plywood circles then 3 - 1/2" foam board insulation pieces. Tar tapped the top and joints. Put in 3 - 3/4" pvc tubes for entrance/ventilation. Filled a plastic coffee container with sugar and slipped up in from the bottom. Stuffed the bottom with natural burlap then insulation.