BD - Thank you for your rather thoughtful and extensive response!
Inheriting someone's orchidarium seems like a nice problem to have. I might have to think about building one based on some of the comments you have made above. I have unfortunately never had an opportunity to see an orchidarium in person, so I am always curious when I see people posting images such as yours where you can actually see the "heart" of the appliance.
Out of curiosity - were you finding that your plants were drying out prior to adding in the bubbler because of the lamp and the fan - and as such, you needed to add in an active humidity source?
When your plants do bloom, do you leave them in the orchidarium? I have a habit currently of removing blooming orchids from the terrarium they live in and porting them over to my dining room table where I can enjoy them once they are in bloom. When the blooms are done, I return them to the terrarium. I wonder however, if in the case of an orchidarium where I could maintain a high humidity environment, if the change in climate (high humidity of an orchidarium to lower humidity of my dining room table) might be too hard on the plant. My plants are not currently receiving any additional humidity/moisture in the terrarium I keep them in - so any "shock" they might feel is certainly lessened.
Thank you again for taking the time to respond. Very much appreciated!