Building your own bookcase is a fairly easy process. Bookcases are a great way to display your personal library. Bookcases are also a terrific storage option. When building your own bookcase, just remember to keep the shelf length at 32 to 36 inches. For the best bookcase support and a clean look, use dadoes as the joinery for the interior bookcase shelves, and attach the top bookcase shelf with rabbet joints. Finally, gluing all joints will help both your bookcase and your books stand the test of time.