massive brass plate for isolation

Dissimilar materials used together are going to work the best. Sistrum was making a rack our of massive brass shelves and legs, that was supposed to sound great, but I don't know if they ever got off the ground with it...

Mixing materials with different resonant frequencies will offer the best solution when it comes to building a rack, or shelf. Try some alternating layers of different materials and see how that affects the sound...

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Keep in mind cymbals are made of brass. They ring. Size determines
at what frequency they resonate at, ask any drummer. Just a thought.
Joe

If your looking to isolate a TT especially with spiked feet, I've been experimenting with 1" thick plate of aluminuim braced on the bottom with cross bars of 3/4" square aluminuim. I've had some great results so far as a top to DIY sandboxes. A couple of manufactors will cut plate aluminuim to size for you. A 20x24" plate 1" thick cost me about $200 delivered to my door.

Sorry to not answer the thread question. I really do not know about the brass.

Savant Audio advised me to try using a 2-3" thick Delrin sheet screwed directly up against the base of component and then to use the Walker cones and disks below that.

My sense is that a brass plate would simply transmit vibrations, and perhaps ring into the bargain, as others have suggested. You need Isolation to improve the performance, a slab of any resonant material, absent anything else, will not give you that.