What does a successful NecTAR application look like
I don't have any personal experience with NeCTAR; maybe someone who does will chime in.

But if it's anything like the US and EU analogues I have worked with (e.g. PlanetLab, GENI, OneLab), this information is used mainly 


to collect information about how the system is being used (e.g. to report back to funding source), and
to filter requests that are clearly ineligible (e.g. "I want to host my personal website on your cloud"),


not because they reject some serious, eligible requests based on application details. 

If that's the case here, too, you really don't need to worry too much about what you write. Something of the form


  My research is on X. I will use the system in order to do Y.


should suffice. (If you happen to have a project website, adding a link to it is also nice.)