To complete this project, use two store-bought bookcases with adjustable shelves. (Avoid models more than 5 feet tall because they typically have a fixed center shelf.) You may want to cover the back of one -- one that will be the front of the armoire when closed -- with wallpaper or a higher-quality wood that's painted to match the project.
Maximize your work space by using a deeper bookcase for the side that will serve as the desk. (We used a 36-by-60-by-16-inch bookcase for the desk side and a 36-by-60-by-12-inch bookcase for the other side.)