Is the Katoria cabinet solid wood or engineered wood?

The listing describes a painted finish and artisan construction in Arizona but does not name the wood species or panel type. Ask the maker or check the full spec sheet before buying if solid wood matters to you.

Can I add more Katoria units later?

Yes. It is a modular piece, so it is designed to sit alongside other Katoria storage. Measure your wall first, since each unit is 31 inches wide.

Does it come assembled?

The listing does not state assembly status. Hand-built US furniture often ships partly assembled, but confirm with the seller before ordering.

It is listed for office use, and the 31-inch width and painted black finish also suit a hallway, bedroom or living room. It is a low storage cabinet, not a tall wardrobe.

How does it compare with a big-box storage cabinet?

You get US hand construction and a modular system instead of flat-pack panels. In return, you give up open shelving and the very low cost of mass-market cabinets.