Yeah @pindac I probably made my last tome arm board in the ~85-88 timeframe.
I don’t know if I was advised to use aluminium, or just lucky, but it is likely a plate of 6061 or 7075.
My feeling is that it probably was an improvement over the MDF tonearm board.
But I am not overly sure.
I suspect that there were LOMC back then. However I was running an AQ606 or AQ404 cart.
There are a lot more cartridge options available now.