What are the dimensions of the sliding barn door / shelving unit?

If you need Solid, Contemporary, Fiberglass, Interior, Entry, or Traditional doors, go to www.etodoors.com or call (888)Door ETO.

I meant to write pizza oven.

The bigger point is the statement that it might make. It creates a focal piece. Generally speaking shelves are cheaper than full cabinets. The door can be expensive or very affordable depending on how complex the construction is. We sell the track hardware like you need starting at $250 for the kit with free shipping: https://www.reclaimedlumberproducts.com/catalogue-of-sliding-doors-barn-door-hardware

For example, we attached a pic from a customer of "non-traditional" application where they used our flat track barn door hardware to mount a window. Isn't that cute!?

Also from a functional perspective, the door keeps dust out of the shelves and could hide clutter. You could use bigger, wider, deeper shelves than might traditional be found in a cabinet box, too, which would give you flexibility on what to store on them.

This chalkboard door in your photo is a great dual purpose idea. We have a restaurant that we supply doors, paneling, and hardware for that did the same thing on a sliding chalkboard. When it is closed it hides the entertainments system and TV; plus they get to write neat messages on the chalkboard. https://www.reclaimedlumberproducts.com/blog/designing-reclaimed-materials-restaurant