now I gotta see that piece of Boxster art. That will skyrocket you on #1 of the Art-Gruppe.
Vinyl: 3M is fine (I am pretty confident), I used Oracal for my sides (that is sturdy stuff).
It all depends, what (full car or just parts) and how you wrap. If you are in doubt, ask the Pros, they will know for sure, what works.