Planter bench plans | HowToSpecialist - How to Build, Step by Step . This step by step diy woodworking project is about bench planter plans. If you want to learn how to build a beautiful . Add glue to the joints and make sure the corners are square. Fit the slats to the supports and secure them into place using 1 1/4 screws. Building the planters. Next, you have to build the side walls for the..