Hey telengard,
I just checked out your cab on your web page and I gotta say your cab looks great. You could easily add a windshield motor and put one of those castors on it and put it behind your support board along with an H-Bridge to control it.
I also see a lot of similarities on your monitor setup and mine. as far as the bezel goes I am still researching how to make one out of black construction paper. Also I notice you're running visual pinball on your cab, I have mame, visual pinball and future pinball running on my cab using mala as my front end and a plugin for the mala front end to automatically rotate the monitor via parallel port wired to a h-bridge.
Have you ever thought about trying another front end like mala to rotate your monitor automatically with a motor?