03-14-2015, 02:09 PM
Andy, I think the answer to your problem of keeping the levels straight when stacked and moving up and down is to make the backdrop very strong, and then build a second piece also strongly anchored to the layout behind the back drop with heavy duty roller bearing drawer slides between the two pieces. The drawer slides at the ends of the backdrop would maintain straight and plumb as the screw mechanism that Jim suggested would move it up and down. Since the drawer slides are @1/4" thick, you would probably need to mount them on furring strips to allow for the bulk of the screw mechanism.