The workshop has two very large openings, one in the front wall and one in the back wall. They will be sealed with four very large, hinged, steel-frame doors that Yunker is fabricating in his own workshop. Each door is about 14 feet tall and 7 feet wide and will weigh close to 1000 pounds, so he’s making the hinges from scratch out of stainless steel. Here is one hinge under construction.