I see the room is still under construction, so I'm assuming wires and whatnot will be fixed before a bird is introduced. Seeing as you have a large room you are able to modify for a parrot to live in, I think you have the space to house a larger cockatoo! I *personally* would look at elenoras (a type of sulfur crested), as they are still a larger cockatoo but seem to be more suited to a domestic environment than the others you have mentioned. I know there are bird-safe plants out there and would assume you have quadruple checked all those plants are bird safe before adding to a bird room

I would make sure that fan is covered in such a way a curious tongue or toe cannot get in and sliced off by the blades. You may want to consider "boxing" it in somehow. I also see a lot of metal elements in that room, have you checked to be sure none of them contain zinc or other toxic-to-parrot metals? Also, not sure where you live, but what are your plans in the winter/inclement weather with only a screen protecting your birds from the outside? Keep us posted, this looks like a great project that just needs some refining
My general suggestions would be a large java-tree or metal play stand along with perhaps a hanging cargo net or hanging swings in addition to the live plants to provide a number of perching/playing areas, along with A LOT of chewable toys. If theres not many chewing options, those live plants don't stand a chance of making it the first week with a cockatoo (even a small one, let alone a big one!). I love the tile floors! Do you have the option of installing a drain and having a hose in there to wash everything down? That may make cleanup of such a large area a lot easier

Overall, as long as your checking the safety of the things your putting in the room, I really think thats a great aviary room for a cockatoo, who NEEDS maximum space!