I think you'd have to design it to include ladders, and perhaps levels, that can take you to every pot. It should have an automated irrigation system that can also be easily accessed for maintenance and repairs.
@Tachyeon Possibly. 316 grade stainless steel would work best. The gardener would need to keep everything pruned at least enough that vines and leaves didn't get entangled in the ladder and the upper rails, rollers or wheels.
