@au_lait I am quite familiar with Panzerholz and Permali, I have some very nice P'mali Boards and am fortunate to have purchased a supply oof P'holz with a friend who has CNC Produced a P'holz Plinth for both of our SP10 Mk II's.
I have listened to the SP10 Mk II in a P'holz Plinth for a few years now, at another friends, and this past weekend on Saturday, was demonstrated one of the CNC Cut Plinths produced for the SP10 MK II, for the first time in my friend's system since it was exchanged from a Marine Plywood Plinth.
The P'holz Plinth has been mounted on to a P'holz Sub Plinth to create a Two Teir Support Structure.
My comments on the last occasion I visited, when a Marine Plywood Plinth was in use; was based around detecting a detractor, of which the fundamental cause was suggested to be from the Cabinet Speakers. I was awarding the Speakers Cabinet as causing coloration.
This Time around, I was very quick to make it known the same Speakers were quite transparent and getting a fix on their placement was now much more difficult, the coloration that was suggested as being present in the speaker's had seemingly disappeared.
A set of Electrostatics were also put to use, and the Cabinets and ESL's were seemingly with parity when it came down to Transparency.
One other point of interest is that on a very well-known Album, I was confident that the replay on this occasion, was delivering information, I had not detected before when replayed on a selection of systems.
The change of Plinth Material in this case has had a notable effect at managing a distortion that can be passed through a Styli, and manifest downstream at the Speaker.
I can't help but think the Sub Plinth has been instrumental in assisting with the additional detail being detected in a replay. As a P'holz Sub Plinth has proved quite a valuable addition to other equipment used at demonstrations prior to Saturday's Visit.
I know the cost of receiving Panzerholz outside of Continental Europe can be quite prohibitive.
Permali is a Densified Wood that is a little easier to find, maybe the licensing for the product is eased.
In general, I encourage a search for Densified Wood as most Countries produce their own Brands, that all share very similar properties, it seems the weight for Overseas Shipping seems to be restrictive, hence the home-produced material.
The Dymond Wood is found in a Board and is found in many colours, this might appeal to a would-be Plinth Builder.