Maple platform under turntable, How thick?

As I said, there are many out there. If your floor vibrates then you want to isolate your table from it; if not coupling is fine. The only general rule I have discovered in audio is that there are no general rules and that what works best is determined by the particular circumstances of your system. That is why after 50 years in it I still haven't achieved Audio Guru-hood, I don't try to give absolute prescriptions from a distance; don't trust those who do.

Right. Stanwal, thank you. There is virtually no vibration coming from the floor so it seems that both coupling and decoupling should work. I think, I'll try brass cones first.
I wonder if anyone tried platforms made of other wood, say, oak, cherry, spruce, ebony etc. How about 5" thick snakewood or ironwood platform?

In my limited experience. Maple or Bamboo make realy nice platforms. Only reason I haven't made any platforms my self is due to the cost. Wood is realy expensive.

I found the Edensound Bearpaws add openness and Organics..The bass slam increases considerably..I used the ( Thorens TD160 ) Bearpaw Seniors ( 2" )on a 2" thick Maple Slab.....

I haven't experimented with all the ideas mentioned above, but I can tell you this... I put my Spacedeck on a 4" thick Mapleshade block on top of their included cork/rubber isolators and it transformed the sound completely. Amazing improvement, and this is in a system where the table and electronics are already in a different room from the speakers. Could another type of footer be even better? Maybe, but I never felt the need to go any further. The Mapleshade wood is a bit different from most others in that it is air dried and that is supposedly responsible for a better sound. I wouldn't doubt that it does make a difference. 4" is reportedly better than 2".