Ana White over at ana-white.com has published easy to follow steps for building your own 2′ X 4′ waist height gardening beds. She includes a list of materials, tools, and cut list your will need to complete your project and 10 simple steps for building the beds.
Counter Height Garden Boxes 2 feet x 4 feet
Counter Height Garden box are easy to build and great for those of us that just can't get down on the ground any longer. These would make a wonderful present for your mother or grandmother. You can build three for nearly the price of one so consider 3 family or friends that might want these. I have 6 for myself and absolutely love them. Absolutely do not us Treated Lumber. This will defeat the purpose of having a healthy garden and healthy vegetable. So don't skimp here.