@buellrider97
Great choice on the Townsend Podiums.
Regarding the platforms, your idea of using a butcher block and spiking it will work. I did that on a Turntable setup to isolate the Turntable from external vibration, and I actually heard less rumbling. Just make are you have a Thick enough Butcher block (say 2 inches or more is possible). Then add a set of Iso Pucks for good measure
I would suggest using Gaia Oreas instead of the Isopucks for the Pre-amp. it's tuned for more narrower weight range that your Preamp will fit in. I use the Oreas for my preamp and it help in a cleaner midrange IMO.