From what i have hear, you need to get a lift to the topo f Thredbo and then walk about 200m to the main ridge. Thats the comp site.
Also there is supposed to be some decent flat area (at the bottom) around the Perisher Blue resort too.
Go to http://www.kitepower.com.au , find their contact details and ring them. (probably ring Goshen at the Geelong store). He will be able to give you much more information.
schmik