You might want to visit your local California Academy of Sciences and even the SFZoo to get a real feel for such environments. They are both limited by being entirely indoors without much natural light but they are local.
Here is where you need to make decisions between quantity/diversity vs. quality of enclosure and animal welfare.
I’ve been to both places and I’m using the Californian academy example more than SF, just with a more horizontal path if that makes any sense.
Animal welfare always comes first so I looked through the current species lineup of animals that I think I could create a reasonable exhibit for in this indoor rainforest. The main species currently at the zoo are...
Squirrel monkey
Cotton top tamarins
Red-rumped agoutis
Great curassow
Malayan wreathed hornbill
Macaws
Aldabra tortoise
The various assortment of birds at the zoo can fit in a free flight section and most of the herps should be able to fit in well sized exhibits.
Since each section would be clearly separate from each other, I think I’ll follow the Californian academy model with the herps having terrariums but they will be within the free flight zone. Maybe have like a mock rock wall with the terrariums or something similar. I’ll do a written out design soon to explain this better.
For each section I think I’ll limit myself for the following. Please note that tanked exhibits don’t include any current small reptile/amphibian or invert the zoo has. Didn’t have the site in front of me so the numbers for them are very subject to change but should work with the additional species:
African rainforest = 1-2 medium sized mammal species, 1 single aviary for a large bird, 1 exhibit for a large reptile, free flight birds, 3-6 herp/tanked exhibits.
Asian rainforest = 1-2 medium sized mammal species, 1-2 single aviary for a large bird/ bird that is unable to be in a free flight system, 1 large reptile, 3-6 tanked enclosures, free flight birds.
Neotropical realm = 4 medium sized mammals but some exhibits might be mixed so the number of mammals depends on exhibit, 1 single large bird exhibit, 1-2 large reptile exhibits, free flight birds, 3-6 tanked exhibits.
The Neotropical realm would focus on species from Guatemala to educate people on the conservation efforts the zoo is doing. If these numbers are asking a lot please let me know. This hypothetical design would take up the current zoo meadow space and a chunk of space from the outback exhibit which in my design for a master plan, exists in a different form. If these numbers are good, what species along side the ones I’ve listed from Oakland zoo would be good picks? Or to ensure this thread isn’t thrown into fantasy and maintains its current topic, what species from Africa and Asia that fit these perimeters are commonly seen in indoor rainforests?