I tried it about 10 years ago. It didn't last too long. I had a hard time keeping it watered enough. I should have set up irrigation with it. Potting soil will dry out really quick without some additive to retain moisture. I was trying it for strawberries and once the berries were done it was hard to remember to water the plants.
As far a framework, I just used some steel fence posts and tied the gutter to them.