I ended up getting these items from Beakaboo who are an Australian company based in Queensland. The lady I spoke to, Lisa, was extremely friendly and helpful and also agreed to custom make the feeding platform you see Trix standing on without any hesitation.
I got the feeding platform idea from Natural Bird Co who I was going to use initially until I had a few conversations with the owner and discovered they no longer ship to Australia due to our crazy high testing costs on imported wood (something in the order of 30 pounds per piece of wood).
Anyway, I have absolutely no hesitation in recommending Beakaboo, especially to Australians as I found it quite hard to find many good companies in the entire country. It was actually the owner of Natural Bird Co who helped me find Beakaboo in the end!
And as a bonus here's a photo of our canary, Puff, who is also enjoying her new perches!