Granite Bases for Vandersteen speakers

Looks good. Can't help thinking the turntable might need better support.

if we are talking about mine my table sits on my version of a Ginkgo platform the floors in my place are bounce 

You're right about granite, it does all you say. Yours are custom cut versions of the machinists top plate that have been under my turntable and amp for many years.  https://systems.audiogon.com/systems/8367

Something I always suspected, but it took many years to hear it, granite imparts a hard edge. Always suspected, because hit it and it makes a high pitched ting or tink type sound. So its there, but might be hard to hear right now. It was for me. Meanwhile there's all the benefits you can hear and already described.  

Fortunately it turns out the mass makes a great base for springs, and the springs do a great job of erasing the hard edge ringing. I notice a lot of components still on factory feet. If you want to try a nice improvement, Nobsound springs on Amazon are very cost effective. Meantime, good work!

I wonder if IsoAcoustics footers would work even better, or perhaps those footers on granite would be ideal. I would think just using a granite plate would compensate for a bouncy floor, but at the same time easily reflect vibrations back into the speaker, which you would not want.