On the subject of Panzerholtz used for plinths here, finally , is my effort.
I will claim credit for the design but all the manufacturing was farmed out to much cleverer people than me. I need here to thank both Paul and Simon for their help and advice and also to Helen Bach ( who is not a Helen ) for his very very helpfully steering me towards simpler is better...the design started way over complicated and has been distilled down to ( I think ) simplicity itself.
A few details....
25mm thick B25 Panzerholz..which, I think is 40 ply. I tried to like the raw finish of the panzerholz but couldn't so the top surface is finished with a sheet of 0.6mm carbon fibre sheet. Next time I will just veneer it with something better looking.
Platter is one solid lump of aluminium 80mm thick and weighing 15 kilos.
The platter floats on two opposed 100mm wide ring magnets. One set into the plinth and the other set into the platter.
The 'bearing' is a vertical 12mm thick tungsten carbide shaft ground to a near mirror polish that goes into a very large oilite bushing set into the platter itself...very simple design.
The motor is a 24v Rega motor that is capable of starting the platter off from a standing start with no manual assist.... but I tend to give it a nudge anyway. The motor pod is a hugely heavy lump of stainless steel... the motor is attached to the 'lid' of the pod and the lid is held in place buy a number of 3mm neodymium magnets. The pulley was machined to run either one or two belts. The motor is selectable for 33.3 or 45 at the push of a button.
The more I look at it the more I think that i will shorten the two non arm bearing wings of the plinth.At the moment they are all three the same length.
Not much else to say about it
Ah,yes.... at the moment it sits on maglev feet but I might change them at a future date.