There's no need to draw a schematic, I think I have a pretty good idea. It seems like it's working, evident through your happy plants. High humidity set ups deter me because it just seems like so much work to get it right.
I wonder if manzanita has some sort of anti-fungal properties. Or if it's just really dense. Don't know, most of the manzanita that I have collected in Oregon is pretty weathered.
Did you use any expanding foam or grout in the construction, or is all the driftwood just stuck in place?