Hello Savio and welcome to IIS
Something to think about with coming to Oz at that time of year is that it is quite a way into winter for us. At that time of year the lower part of Oz experiences a large number of cold fronts and lows that have a lot of associated cloud and moisture as well as cold temperatures (at least cold for here).
Usually the north of the Australia is better at this time of year and it is quite a well known tourist season for that area. The east side of the country (Sydney, Melbourne, Brisbane etc) has a lot more facilities than the west with more major cities towns and clubs but I would say that we would have far less light pollution here in the west.
I would recommend the Carnarvon or Pilbara area at that time of year for not only great skies and weather but other things to do. Shark bay is close by where you can feed dolphins and the Karajini National park is also well worth a visit and will definitely have clear skies.
As for importing wood into the country there may be some quarantine issues but I'm not to sure as I haven't travelled outside Australia yet so hopefully someone else can chime in here and give you some advice.
Good luck with your trip and I hope you enjoy your stay here
