Edit: Another interpretation of what the 400z may look like, based on the silhouette images:
I think I like it...but not 100% convinced. When you brighten the silhouette...it does start to get a little pudgy. But that's just how cars are now I suppose.
I know the above image is just somebody else's interpretation, but i'd like to think i wasn't too wide from the mark, with my own interpretations from back in 2015.
(EDIT) Actually in hindsight, i was well off.