This might not help but while looking for info on this I did run across why Mercedes used veneer and not solid pieces of wood.

The wood underneath has always looked like some sort of softer wood that was easy to work. Then it is covered with a veneer of walnut or whatever.

I always thought this was a cost saving measure but it appears that solid walnut tends to warp after a number of years. And the thicker it is the more it will warp.

Of course if you leave it to sit for fifteen years so it naturally dries out this will (hopefully) not take place. But Mercedes didn't have the time to let the wood sit. At least not in a production based world.

And this is actually more expensive than just hacking a hunk of wood into the correct shape since it takes craftsmen to do this.

All in all their process is another example of building for the long, long haul.

And if you want to see what a real walnut dashboard looks like then scout up a photo of the dash of a Jaguar Mark 7 or later. And it is also a veneer for the same reason: To prevent long term warping.