This high shelf is finally complete. I had a little trouble getting it up there, but remembered how my father and I mounted drywall, and built a jig to hold it up while I screwed it in. I have constructed two trays for this shelf, mounted them, and modified the plumbing system to allow them to drain into trays below.
It is a high shelf. Too high for me to water with my short wand. However, it should be excellent for my high-light plants.
This also maximizes the total obvious shelf space in the orchid room.