You just have to risk it once in a while.
I learned this on a forum from a seasoned modeler that "its just 10 or 15 bucks if ya screw it up!!!"
So with that in mind look at Harrys photos and then your cab....from straight over it you will see what will be cut....and if you screw it up You can always call it a roadster !!!
So in the words of Raul .......Grab that Zona and start choppin!!!!!