Home grown turntable platform/base?

As maple and walnut are the same density, the thicker maple is better value and at twice the thickness, more effective at damping etc.

Go as thick as you can on the wood. Not all butcher block is the same. Don't write off granite so easily, especially if you like detail retrieval, air, and tight clean bass. You could sit the granite on felt pads.

@asahitoro You ask whether you should go Mapleshade or granite. A good compromise is maple on spikes. I use maple with a slate turntable. Remember the hardness "rule". I find it tight, detailed with some sweetness of tone.

@asahitoro Good. I have concrete too. The thing to remember is that, as a basic rule, the harder and less compliant the support, the faster, more dynamic and more detailed the sound becomes. However, you can swing it too far and make the sound a little, um, sterile. Marble and glass can do that. Soft woods go the other direction with the sound becoming softer. It seems ridiculous but it is true. Some argue that low frequency resonances need to be attenuated using damping but, to be honest, I have not found it to be a big deal. Hollow shelves or cabinets are a no-no. Try a 16"18" piece of granite from a fabricator. Stand the granite on 3 points - brass, or something. Ensure all is level. Let us know what you end up doing.

Footfalls are when footsteps cause the suspended floor to transmit vibration to the turntable. It can be pretty bad causing skips or thumping. I’d recommend a 3/4 to 1 inch thick block of granite (not marble and not tiles) on spikes or cones or springs or ball bearings as above. It will tighten the bass and make the music sound cleaner and faster. You can try a sheet of 22ply under or instead too and compare.