Sounds like good ideas, steel shot.
A friend of mine was a DJ, he told me that they would put turntables on top of bicycle inner tubes, stretched across some wooden frames. Hundreds of people dancing, and the turntables did not skip.
I guess I am a fan of isolation, rather than adding mass.
I have a turntable hung from the ceiling, in my "man cave", off of long springs. It never skips. Looks cool too.

