HI,
You do see z31's with Lambo style doors and there was even a Gullwing door Z31 in Japan!
There was a company making gullwing doors for the z32 model too at one time.
I think the novelty of them has worn off now, since every model of modified car has had them in the last few years!
Here's a Company who make the Lambo hinges for various Nissan models.....
A bit off track I know .. but I do have the technical drawings for the hinges for scissor doors for a ford probe in case anyone is interested. all you have to do is get them cut
Chav wings just don't look kool on any car no matter what .
Maybe if you spend your evening's at the local burger bar hanging with the crew, You might just get away with them but if you're over 20 then they're definite a NO NO!
pm me an email and will send them to you. Won't claim to know how they work or if they are complete either, but a friend of mine got them for his brother to use.