Typical ministry job that one - we've got some money to use up, lets make something! Never did get it tested correctly as they pulled the plug on us.
I was involved with tunnel testing for a few years - 13x9, 8x8, 3x4 and BLT.
You have to keep an eye on people as they move the floor (roof) up and down, you can't rotate those handles more than a few turns without adjusting it's neighbours as well, otherwise there is a loud bang, followed by a rush of student disappearing...!
If I could just get the afterburner working...