Rick:
Not sure if your situation will permit but take a look at my system photos for a possible solution. What you will see is a target PS-1 wall mount shelf that passes through the back of the cabinet and is bolted to 5/8" birch ply that itself is screwed to the wall studs. Turntable sits inside the cabinet away from prying hands but is not influenced by cabinet resonances at all. In fact, the walls of the cabinet actually protect the table from airborne resonances. Not that hard to do--took me a few hours with my father in law assisting.
Not sure if your situation will permit but take a look at my system photos for a possible solution. What you will see is a target PS-1 wall mount shelf that passes through the back of the cabinet and is bolted to 5/8" birch ply that itself is screwed to the wall studs. Turntable sits inside the cabinet away from prying hands but is not influenced by cabinet resonances at all. In fact, the walls of the cabinet actually protect the table from airborne resonances. Not that hard to do--took me a few hours with my father in law assisting.