That's a great looking cabinet. I like the design a lot.
You've received a ton of great advise here especially about wood movement and grain orientation. In general you rarely see modern designs like this made of solid wood without a frame and panel construction, especially the back panel and doors. I worry the doors will eventually cup and not close correctly with such a large panel unsupported by a frame or battens.
With such a well setup shop I wouldn't hesitate using plywood for such builds with solid wood edging. The case, doors, and back panel would be great choices for plywood panels.
Also one last comment, I wouldn't hesitate in making your shelves thinner. They might be just a bit chunky for the design and you'd be surprised how strong wood really is. You can get away with much thinner shelf stock than what you typically see people doing. Mike Pekovich is a big advocate for making parts much thinner than you think you can get away with which really adds to the overall aesthetic of a piece.
And good god, leave a little dust behind once in a while!!! That Tesla I'm sure would like to know that someone is actually doing some woodworking in that shop.