Apparently there is a fella in Japan who makes the best replica's of the Gnose, since the factory stopped making them years ago. Everyone who has a genuine HS30-H Fairlady 240zg goes to him if they have an accident or damage their original nose cone.
I can't recall the website off the top of my head, but I do know one exists for this guy. I think from memory pricing was about $5000 AU.
If you could reproduce it exactly like the original (I would be extremely fussy mind you) I would be interested, but I fear the cost of tooling and reproduction would cause it to be an expensive venture and I'm not sure how many fellas in Australia truly appreciate the G-nose style. It really is something you have to judge in person and it does look awesome, but cheap copies have tainted it over the years.
The headlight covers are probably the most expensive part of the exercise too. At $700 AU plus for the chrome strip.