I know kookaburras in mixed-species aviaries tend to be problematic, but has anywhere mixed them with mammals? I'm specifically wondering about either southern hairy-nosed wombats or short-beaked echidnas.
Secondly, how would a fly river turtle do in a walk-through aviary, provided that there is a large water feature? The aviary would also have tammar wallabies, masked lapwings, Australian wood ducks, and various small birds (Bourke's parakeet, eastern rosella, Australian crested and/or diamond doves, and various estrilid finches).