That vise is quite a find, a new equivalent to that would cost a good part of my paycheck. You said you were going to add casters to that three legged stand? And mount the vise on it? That to me is scary, when I put something in a vise, usually there is some serious bending, hammering, or sawing to do. Having the stand movable is okay, but not having the vise securely mounted to a table that is immovable, makes working with it really tough. That and having a 200lb vise mounted so things are top heavy means sooner or later it is headed for the floor, where my feet are! My large one is bolted to an all steel welding table, the top of which is 5/8 in. steel plate. Would hate to ever see something that pretty hit the floor.