That wood looks really hefty! :drool:
I used 1/2" sst all thread / fasteners on my stand.
It was cheap

, so was the wood I used.
I looked at MDF, but having to buy a piece (4x8) large enough to side a house was a bit more than I needed.
Rubber feet came from a local mom & pop's hardware.
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I was concerned the wood I used would resonate at higher volumes, but it handled TL's
Emerald cranked very well.
I can say I used a press on the smaller ones and it made it easier. Drilling pilot holes on the larger piece helped.