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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.
Rick, what a great solution! Love it. I wish I had a cabinet big enuf to try that. :-)
Riley804, FWIW, I'm not convinced that you have really isolated floor borne vibrations, or air born vibrations for that matter, by using metals and woods in any configuration which IMHO probably do not damp the vibrations you are trying to to prevent from reaching your TT.
Personally, in your situation, I would have kept it simple by placing some sorbothane type of rubbery product on the cabinet shelf and a piece of a soft wood on them to make a platform for your TT. To minimize the cabinets interior reflecting surfaces I would get some moderately dense but thin foam and line all of the surfaces about and above the TT.