I'm going to start building a shop this summer. The question I have is that I want a big door to be able get large equipment in if I need to. I can put a bi fold door and be plenty wide but then every time I open it in the winter, the shop will take forever to warm up. I want to put a double overhead door in it with a removable center. It has to work well and easy enough so I will actually want to use it though. Who makes these. Any other ideas are appreciated.