Like the stained bead board on the back of the bookcases. Think that would look & sort of play off the paneled ceiling. Probably would not even need to be built-in/custom made. Could probably be a DIY project with a/some nice piece(s) of furniture .... repurposed .. or not.
Love love love the splash of orange above the fireplace! DIY Fireplace Surround Perk up an old fireplace with this DIY fireplace remodeling project that uses stone veneer to completely transform the look of a fireplace facade.