Although I understand that you are looking for someone based in Melbourne, I would still like to provide my proposal.
As for credentials, I am a Product Designer by profession. Basically I sketch for a living. Have Masters in Product Design from DSK ISD International School of Design.
It is the international campus of Institut supérieur de design in Valenciennes, France. You can have a look at my portfolio on freelancer.
Skillset includes rapid sketching, detailed sketching, ideation, conceptualization, marker rendering, tablet rendering, photoshop rendering. Pro-efficient in Rhinoceros + Keyshot.
Ready to discuss the project and can start immediately!
P.S: I am based in Mumbai, India, and can travel if required.