For me, wood is the only possible material that relays the emotional content of the music. The type of wood is also crucial as well. Beaten with the knuckle at various planks, gives an idea of the sonic result.
Basically, I only use domestic woods, not only for sound but also from an ecological point of view.
The process for making these is very time consuming because they are handmade. There machines are used, but patience and perseverance is required to finish the process. I do not use lacquer; I only use natural oils, waxes and Balsamterpentine, which are applied in many layers with bales on the wood. This gives the wood a very warm appearance, optical depth, and a wonderful smell.
Here one of my associate at work cutting the motor board. (Jürgen from CNC-Prototypen):