I am not certain as to your question, but I am reminded that Pickering made a turntable in the Sixties suspending the turntable with a pair of circular magnets. I had one and it worked OK.
In order to float a heavy plinth, the magnets must be able to generate a very strong magnetic field. Cart is very sensitive to magnetic field. Unless your cart is well shielded, given the close proximity to strong magnetic field, the result could be disastrous.
There are several commercially available turntables that sport a magnetic suspension of the platter. See especially the Verdier La Platine. It's not a new idea, and it's not a perfect solution to the problem of a vertical bearing, but it can be made to work well, as in the La Platine.
I've played with pair of 3" ring magnets: it easily supports my 32 kg 4" thick platter placed below it. But the magnet field went up to 20 gauss measured at the record plane - to much! Three layers of mu-metal sheets did not help much. There is another inherent drawback: magnet repulsion is essentially unstable; every minor deviation from perfectly concentric magnet fields (unevitable) produces considerable side force applied on journal bearing, increasing bearing noise. So I finally abandoned this idea.
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