I still think Tree-Top Monkeys could either extend towards the butterfly house, over the Tiger off display enclosure, or expand further along the path that runs between the Tiger and Gorilla enclosures on the way out of GR. This adds to my previous suggestion of Hutan's enclosure being flipped, where the viewing side is from the Gorilla Rainforest, and it could be used to house Bongo and Okapi (though I know we have suggested the Giraffe enclosure would be good for this.
I do not support knocking down the Treetop monkeys. It could be spruced up and extended, but not physically replaced. I would love for a walkthrough Colobus section but only if it is able to be squeased into the space along the exit path.
As for the Platypus House, it is a small enclosure tucked into an area that has (what I think) are BOH for the giant tortoise and Zebras. It may be an enclosure that is not stopped from becoming heritage, although when I last walked through it I am pretty sure that there was only a single Platypus in it, which *may* indicate that MZ are planing to phase them out and consolidate them in the World of the Platypus at Healesville.
I would like to see the Wombat burrows moved, and make the area upon exiting the GFA be like entering a Tasmanian gully, and have it be the start of an immersion to Tasmanian Devil, Pademelon, Potoroo, and maybe a new place for Platypus, this could then emerge into a next section with a different regionally themed (Australia), maybe being the Otways, or something. This is if they keep an Australian section.
Otherwise I think the Growing Wild area should be converted to an Australian Bush and Rainforest area, consolidating all Aussie animals to there, including Little Penguin and Pelicans, a new Australian Aviary, Kangaroo walkthrough, and some dense bush areas, utilising the planted out area. Cassowary here too. Then GFA and Australian Bush area can become a South American precinct.