Made some grow boxes. 1x4 cedar sides with 1x2 cedar boards for "legs" all held together by titebond II wood glue and exterior galvanized nails. Bottom made of aluminum window screen secured to sides and 1x2s with stainless staples. A little weather sealant for extra durability. I made (3) 9x9 and (2) 12x12 boxes from $20 of wood. I just wanted to share this in case anyone wanted to copy. Very easy to build and should provide more than enough drainage and air.