Diy Corrugated Metal Planter Box . I used both 2 1/2″ kreg screws and 3″ wood screws to build the wood frame and 1″ roofing screws to attach the corrugated metal to the frame. $149.95 previous price $149.95 6% off 6% off previous price $149.95 6% off. Planter box, made with recycled hardwood and corrugated iron Planter from www.pinterest.co.uk Use four of the 2″ x 3″ x 4′ pieces of wood to make the bottom frame of the box. • 2x4x8' (x6) • 2x6x8' (x3) • 2 1/2 pocket hole screws. This is a great diy project to add some growing space to your yard.