I recently had the pleasure of meeting two women who are in the process of launching a new horticultural therapy professional practice. We may collaborate on a health center project they support. It would be my pleasure to do so. As a senior with two knees due for replacement, I can relate to the needs of those who are not physically able to practice traditional dirt gardening.
The planter system shown here is a product of a UK company named Instaplanta. In my opinion there is a huge market for systems of this type to serve the needs of those who are physically limited at any age.
Add the fact that there is a huge baby boomer generation entering retirement age. Then add the current interest in school gardening. A system of this type is a natural for all of these needs. It is a natural for urban greenscaping.
The only thing misssing in this system is sub-irrigation. It would be easy to add a sub-irrigated planter insert (SIP) feature.