Hi,
In theory, I am very happy to help you with this project. However, you have not specified the duration of the narration you require, nor how it is structured, etc. Consequently, I can't estimate the time it will take to complete the project. As a result, my bid could be higher or lower than should be the case.
Please listen to the demos in my portfolio and I'm confident you'll hear the type of Australian voice you're after.
As a mature Australian male with a Bachelor of Science, Diploma of Education and many years experience as a science teacher then a professional writer and speaker, I'm very comfortable with technical terms and explaining these types of topics.
Cheers,
Graeme Bowman