I might build 12 stud wide Model Team trucks all the time, but I still have very little experience building cab-over designs. There have been a lot of prototypes before I ended up with this design for the Octan truck:
The truck uses a lot of SNOT-techniques from the front to the windows in the sleeping cabin and slopes for the stripes. I have tried to give it a lot of "make up" around the wind screen to make them appear taller than the 2x6x2 bricks.
Click here to get to the BrickShelf gallery with some of the many prototypes.