I am officially a telecommuter. When not traveling I have the amazing perk of walking 30 feet down the hall and I'm at work. My office also serves as my workroom, sewing room, library, and accessory storage...it's a busy room.
Build a wall-to-wall bookcase with closed bases & window seat for $1000 / 3 weekends. 'Stylish Shelves - Step by Step | The Family Handyman.' Great tutorial with schematics, photos, material lists and instructions to adjust to your exact dimensions.