you guys are thinking about this all wrong. What you do is buy the wrecked gtr which hopefully it still drives and such make those repairs then take and have the body panels of the z and have a shop put them onto the GTR. Granted it will be a stretched z of sorts but then you have the best of both worlds.
I have seen this done with a g35 that a shop did here in tampa that they molded the front and rear of a 350 to and even made it a wide body. but hey it is something different.