Hello!
This is my first entry for that speed texturing challenge,
I didn't like so much the subject, but...
I started collecting some references of metal, rust and vehichles, then baking ambient occlusion in modo.
The result was a map with a basic metal texture with ao.
So I added rust, scratches, paint.....and bird poo!
For the normal, once the diffuse was finished, I used X normal.
Finally(last 5 minutes) i made the specular map!
That's all!