[ger21]

I didn't look it up, but I know what you're talking about. I think you'd have a lot of friction, and the aluminum would start to wear somewhat quickly. You'd probably need to lubricate it, which would cause dust to build. I guess I'm trying to say I wouldn't use it. Do you have some type of design in mind? I really have no idea how you plan to do this. Are you basically trying to duplicate the Panel King? And you want it to accomodate 4 x 8 sheets? I'd go with some type of linear bearings to minimize friction.