Over the last few days I put together a patio planter box, 7 ft long, 32 inches high, 18 inches wide, sized to fit the available space. It is raised off the ground a bit, so the planting bed is about 18 inches deep. I made it all out of redwood fence boards and rails (being picky at Lowe's to get good ones) except for a couple of pine 2x3 rails to hold up the bottom slats. To make the top look nicer, I used redwood 2x4 deck boards, and even dared 45° corners cut on my old plastic miter box. When I got done, I had enough scraps left to build two movable divider panels. What is left is another coat of stain, polyurethane for the top rails, and installing a fabric liner to keep the soil from leaking out.