Could use conduit if you can get it bent to form. Drive rebar in the ground at points along the bed edges and run the conduit ends over them to provide more stability. Could even set a coupler on the conduit with the set screw to tighten against the rebar to hold it to it.
Just another thought after seeing the metal framework of the Lee Valley setup.
Something store bought might have a little more of a finished, aesthetic look to it...
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