There’s a great materials list, including drawings of each part that you’ll need. There are also build instructions with photos. The larger frame fits into the rails with the extended bolt or thinner wood inserted into the rails. You can raise it or lower it and secure with straps.
Please note, I always click “View All Steps” at the bottom of the article. There are 9 steps in this project.
Click on the How to Make a Space-Efficient Gardening Rack link below to see the complete tutorial.