Making a box with finger joints is a long, slow process in most art programs like Adobe Illustrator, Inkscape, or SolidWorks. Rahulbotics box generator to the rescue! If you use a beam width of 0.1mm you should have a good friction fit. Open your PDF in your favorite art program, add your holes, and save as DXF. Now you are ready to contact us and get cutting!
Picture courtesy of Wikipedia.