bdank,
That is outstanding Engineering!
I have been sitting here this week trying to figure out how I can build a cage to fit my EarthBox for the Pepper plants. Your design will be perfect. Thanks for posting the photo!
You may want to take pliers or a nutdriver over the upward pointing cage ends, and bend them inward so you don't cut yourself when walking by the cages, as they seem to always point out from the manufacturing process. Just a safety suggestion.
Raybo