I have 3 tiered benches that were made quite awhile ago. They are heavy and have wheels attached to the bottom. Once you have plants on these guys they are really heavy. I have mine on a pool patio and move them around esp when it is raining and I want them to get a drenching. ( Bungee cords hold tham in place or they would topple off.) Otherwise they are under an overhang.
I saw this guy at Redlands but did not closely check out his benches. If you go this route I would see if he can attach a rim along the bottom to attach wheels. He is in Sunrise so it may be worth a trip up this way.
I have a friend that is probably checking him out also.
Orchids are like velcro! No matter where I go, some follow me home!!