Well, the wood frame is pretty straight forward, 4x4s for legs, 1x6" fence pickets for the sides and 2x4s to support the dirt. for the wicking I used about 12' of 4" plastic drain tile tubing, covered with sand. Then about 12" of raised bedding soil. The whole thing is lined with a heavy plastic to hold the water. The trick to eliminate roots rot is the put in a drain so the tubing only holds about 3" of water. I found the plans I used on Utube, there's a number of videos about wicking planters.