Bamboo Board with three tiers as the minimum and compressed on both planes, is a improved Board for intrinsic Damping/Dissipation Properties over most of the usual board types seen used for Plinth construction.
A 401 listened to, mounted on a Compressed Bamboo Board Plinth, is my most impressed listen I can recollect.
Compressed Bamboo Board as referred to above does not cost too much. As a ,material it can be further enhanced for the attractive intrinsic properties, by applying thinned oils for it to absorb. I recollect seeing Shellac referred to as well as a Treatment to improve the properties, all good on my camp, as aesthetics are also being dealt with as well.

