New, enlarged solar oven is taking shape with entrance for pots from the back and not from the top. The top will be doubled glazed and we will have a second plywood box inside the first box, insulated with sheep's wool, and then a metal box over the inside plywood box. The metal box will be painted black. I am looking for 200 degrees centigrade. ! My other box does 125 to 150 degrees centigrade. !