Great thread and build, have loved reading this.
I'm looking at getting the Nismo front end on my 370z, would you recommend it and in terms of paint will the whole front end need spraying?
By spraying the whole front end you presumably mean painting the bumper and blending into the surrounding panels? I doubt this would be necessary, as there is usually a slight difference in shade between the plastic and metal anyway. Some white Zs and GTRs have badly mismatched bumper to body colour. For some reason, the difference is particularly noticeable on white. Although the match on mine was quite good, when I had my bumper re-sprayed following a minor car park scratch I ended up with a better body to bumper match than the factory!
Pre-re-spray - note slightly duller bumper colour
Better match post re-spray