There are (were?) other people with hands in some of those designs posting on the internet with their own designs posting on forums like Parts Express's
Techtalk forum. The woodworking for the cabinets is something that is common with higher-end cabinet/furniture manufacturing, but not uncommon.
They use solid wood edges under (or precisely next to) veneer to give a more solid wood appearance, even though the construction is composite. You have to know a bit about the stability and directional forces and grain of the wood species you use to pull such a thing off. I have a vacuum operation that stabilizes wood with a special resin to make it to where it is pretty much water/moisture proof so I can do this type of build with a bit of confidence.
Rounded over hardwood edges mixed with veneer. I have had these materials for years so everything was pretty much equally acclimated, at least.
On other builds, I have sealed things with thinned (with alcohol) epoxy, or even set the veneer and other parts with un-thinned so basically it's a marine grade construction, at the least. Constructed and sealed with epoxy, thoroughly leveled/sanded, and then coated with high-gloss instrument lacquer or automotive (LPU) urethane
