An interesting project, this one. Whist finding a remote controlled timber up and over door that suited this war time arched roofed building was easy enough, fitting it required a little more joinery than usual!
There were no supports/rafters/timbers in the roof or walls to hang the gear from. I remembered making a display stand at an outdor trade fair a few years ago, and so we built our own internal 3D skeleton frame. Our client thinks the appearance is much improved and the remote control makes him smile every time he uses it.