I finished reading Food4Wealth by Jonathan White (B.App.Sci. Assoc. Dip.App. Sci.) yesterday. It was an easy read, nothing technical or overly wordy as one might expect being written by a guy with a lot of initials after his name. I opted for an 8x8 frame made of 1"x8"x8' pressure treated lumber. Using 2"x8' would have been better but the cost was twice as much. As the book states, you don't need to purchase lumber to make your frame, you could use anything that provides a barrier from outside weeds and of course, to hold in your organic material. The Food4Wealth system is based on growing your plants in layers of organic material. The materials needed and the order they need to be put into your frame are all explained in the book. I spent roughly $80 in all at my local hardware warehouse to get everything I needed.