Panzerholz is not a "soft" material.
Beech is chosen not for being waterproof ,
but because it is one of the hardest woods
and with high rigidity. Whether or not panzerholz
is your preference to use through experience
or not is all fine but the lack of basic knowledge of
it from its ingrediants to why they are chosen seems to undermine the relevence of "opinions". Long wordy explanations of what is basicly constrained layering
wont change the way some hear and choose. The popularity of light weight Rega tables proves that.
I’m quite certain that a slab of panzerholz can dissipate
the energy of a turntables self noise and the music
playback in its environment . The foundation it sits
on is actually a seperate problem.
Solve that first , ....
Besides we're off track on the OPs
original question...