Hi. I've got a metal control panel off of a cocktail-style Millipede machine for sale. It has a hole for a 3" trackball and comes with 1 leaf-style black button. The control panel is hinged on the bottom and can be opened up for easy access. As you can see from the picture, the artwork is in rough shape, but the metal is good, so all you'd need is a new overlay.
The first reasonable offer will get this. It'll cost about $10 to ship it.