If you're going to have any work done to the cylinder walls at all, take it to a machinist who's worked with modern Nissan engines before. I haven't verified this on the VG motor but I know the SR20 motors have a nikasil lining which isn't very thick. So just look into it.
"The 300ZX Turbo is a dance; it's a song; it's rolling, roaring automotive art. There is no color that doesn't suit it. There is no mood-lifting chemical substance it can't replace." - Automobile Magazine