Houzz is the new way to design your home.
Staging with Style LLC
Similar to your fireplace and wider built ins. You have more of a cathedral ceiling so you could either do a faux wall (build it out so to speak) or just leave it open.
Another way to finish off the top into the cathedral space.
Another way to fill in a cathedral space - I don't like the space in between the mantle and the builtin base cabinets.
Glass shelves with dry wall back - cheaper option
These are very similar to the ones I did in the property that I showed you.