Welcome to the Forum.
Have fun with your build. There are many different suppliers of parts throughout Australia.
The New South Wales Cobra Club has a very long list of suppliers from all across. Additionally, many advertise in 'Snaketales' the Cobra Club newsletter.
Additionally, small items can be purchased from the 'Forum" suppliers here, including Finishline.
I found the cheapest and the better quality windscreen was available from Doug Pearce on 03 9 7394222. Doug has five or six Cobras in his workshop at anyone time.
Well worth a visit if you are ever over this east side.
You could possible talk to G Force or RMC in Western Australia describing your body and chassis and they would soon claim or eliminate it. Failing that "post" some pictures.
Cheers
Bernie