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He provides step-by-step directions in the Instructables post. He did use some basic power tools to build the planter. The scrap wood that you use for the exterior trim is going to determine the look of the planter. So that gives you a lot of flexibility.
Click on the Stylish and Low Cost 55 Gallon Drum Planters link below to see the complete project.
Stylish and Low Cost 55 Gallon Drum Planters