Also...
I'd suggest laminate, like Formica (or Wilsonart.. or I've even done the cheap stuff, works fine on a box).
It's easy to do, even... all you really need is a gallon of contact cement and a laminate trimming bit for your router.
Stick on one surface, use the laminate trimmer to trim it flush to the box.
Stick on the next surface, repeat.
Start with the bottom, then the sides, then the front/back, then the top.
I used Formica in my Civic... grey marble, in the areas that aren't grey vinyl or mirror, like my spare tire cover, trim rings for my outer two subs, and backing for the amps.
