consider using space above door and shelves instead of "built-ins" or bookcases, for max storage "wall of books" feel.
Love the Hardwood floors colour
Ideas : Exciting Corner Wall Shelf Ideas To Maximize Your Room Interiors - Fascinating White Home Office Design Ideas With Ample Storage In The Corner And Desk
Storage… take a cheap bookshelf, take the backing off… nail up on wall. looks like awesome built in storage - Interior Decor Luxury Style Ideas - Home Decor Ideas
A bookcase wall.