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Yep, having now got a few test sheets of valchromat that's my current plan. I'd imagined 8mm would be quite flimsy but actually it's rock solid and I think what I'm going to do after recessing magnets into the surface is actually drill the matching steel in from underneath the wooden table and then hide/bury them with whatever plug I drill out. Only thing is making sure the magnets etc are absolutely centred so it fits flush rather than wonky.
Then route the Powerplay mat into the valchromat itself so I won't even need to touch the surface of the main table (apart from sand it and finish it). Then I'll just have a table surface that I could in theory cut to size and use on other tables in the future.
What about rebating the magnets into the lower surface of the sheet and glueing them in place so they sit flush.
Then for the desktop, rebate some steel pieces flush with the surface.
I'm not sure you want magnets on both the table and the topper.
Or, glue some dowels into the top piece and drill some holes for them to locate into in the desk?
Or use a sheet of rubber as your desk cover?