Can you elaborate or link to a picture, please? What you're saying does sound interesting and I would love to have tomatoes too, besides beets and carrot. But I'm not sure how I would do it.

To give you an idea of what I have at my disposal- 3 balconies (except east), all small, 2ft by 20ft. All have iron railings which could come handy for the right type of veggie I guess. ..