A mesh-topped enclosure for Common Wallaroo Osphranter robustus, Emu Dromaius novaehollandiae, Galah Eolophus roseicapilla, and Red Kangaroo Osphranter rufus
That would have to be quite a large aviary that only adds a single species. It should be fine, but I'd personally go for waterbirds and pigeons instead
A terrarium with an aquatic area with Australian Red Claw Crayfish Cherax quadricarinatus and Carpet Python
There's a good chance of the crayfish nipping the python's tail
A walkthrough aviary with Black Swan Cygnus atratus, Freckled Duck Stictonetta naevosa, Straw-necked Ibis Threskiornis spinicollis, and other waterfowl (what are some compatible East Billabongs)
Should be fine. Other species could be Australian wood duck, Chestnut teal, Australian white ibis and White-faced heron
A Netted aviary for Australian Pelican Pelecanus conspicillatus, Cape Barren Goose Cereopsis novaehollandiae, Parma Wallaby Notamacropus parma, and Yellow-footed Rock Wallaby Petrogale xanthopus. Pelicans are a group of sisters, and wallabies are breeding
Depending on the size and design of the enclosure, there's a decent chance of the pelicans eating joeys