I really like this set up. One question. Is there enough soil in the hanging pots to support a wide range of veggies?
Hopefully, @BrendanB can fill us in on the answer. In such a small container you'll want to use the best potting mix you can afford. I would suggest something along the lines of Scotts Osmocote 25L Premium Plus Superior Potting Mix. Herbs generally don't require a large container to grow in, so they are perfect for these vertical gardens.
Yea they are not big enough for root vegetables, although we managed to get baby beetroot and mini red onions. But spring onions and chilli's didn't have a problem.