I've also rethought how to attach the monitors. There is currently a bookshelf where I plan to locate the Treadmill-Desk. I was planning to move it out of the way but now I'll just leave it there and rework the selves to make the bookcase into an over sized monitor stand. Thank the maker for LCD monitors.
That way I can use Kevy's hinge idea so that the desk can be lifted out of the way if needed.