...minus the happy frogs.
If they were alive, at least, I would keep them.
Although I find a terrium/orchidarium project an interesting and fascinating project, I also am aware that if has all the potential to be a source of frustration and concerns.
It might be a misconception of mine but that's how I see it. The environment inside an enclosure it's so fragile that finding and keep the balance between a success and a catastrophe is something really hard and needs constant monitoring.
Orchid growing should be something pleasant and start such a project without the right conditions to keep is something with a high probability of faillure, which is not a good thing.
As far as I know, air circulation and temperature rising are the main factors for faillure so keeping the enclosure out of the equation increases the probability of success.
It might not be suitable for certain species but it will be for others.