That 'ceiling' in third picture, was that mod or official part of that game or pack? If that ceiling part wasn't mod, that could be ideal for flying birds like parrots and birds of prey. And for non-holey iron bar types like those in that third picture, larger snakes like green anacondas and larger pythons. What do you think? (Especially to/for Frontier and Planet Zoo creators)
The ceiling mesh grid is in game not mods at all, I use them all the time for static aviaries and occasionally a ceiling to prevent big cats like a leopard from jumping out the habitat.For the third picture I just used the plaster pieces and the conservation slat beams. I often use the plaster pieces as they work well for most builds!