To turn my old table into a jeweler's bench I bought this white shelving unit. It is a shoe rack and is the perfect height for working at my bench pin. I simply clamp my bench pin to it add a light and a magnifier and fill it up with useful bits. It is made of particle board and can be drilled into if you want to mount other tools or directly mount a bench pin into the front. You can even add a type of sweeps draw by putting a tray in the middle shelf.
It can easily be lifted off and away to give you an empty work surface. It can also turn a table into a stand-up desk. I have glued some non-slip strips to the bottom to make sure it is secure and doesn't move around.