Will,
I used some of the heavy duty UV stable plastic material that is used as curtains on the sides of the big truck trailers.
See if there is somewhere in Sydney that produces these curtains and get a price for 5 m off the roll. It comes on a roll 3 m wide so is good for covering the Mozzie. It may work out to be allot cheaper than having one produced commercially.
The plastic is great to work with; you just overlap the edges and superglue the joints. I made mine about 3 years ago and it's still holding together like the day it was glued after being out in the weather for all of that time. <img src="http://www.catsailor.com/forums/images/graemlins/cool.gif" alt="" />
The only parts that are showing their age are the eyelets.
Regards,
Peter
p.s. Get white plastic if possible since the dark colours absorb heat like crazy and may damage deck paintwork etc.