Houzz is the new way to design your home.
built-ins under stairs
These are all interesting ideas for built-ins. I tend to like the magazine picture I showed you best but thought I'd include these. Your current sketch is similar to my magazine picture, especially if you added a wine cubby in the top corner.
inside railing is interesting
We could change out the top hand rail to match whatever wood we are doing. I love the door style on the white door.
open shelves or wine racks in odd space
not my favorite but interesting
interesting pull-out shoe rack. Not sure I want to use the space and not crazy about the design of this area but worth including
Like the wine rack concept for the top corner.