Sounds good, although I have no idea what the ZR2 looks like. My mate has 2 of the S-10 extremes, they look quite nice but I don't like the engine. Doing custom work on models (plastic especially) can sometimes be very hard. If you make a mistake you may not be able to get rid of it, or it might become a pain.
I know I will have a hard time making my Calsonic into the car I want, it will also be my first time using putty. So look out for a really ugly looking skyline coming your way!