This is how we cut our body contours. It is very quick and efficient. We've found that some body styles will not work using this technique. If your body shape won't fit in the band saw correctly you might find yourself rasping the whole contour.
Draw the Contours
Mark out where you want the contours to be with a pencil.
Using a band saw (preferably a 14") cut along the line for the contour as shown.
Rasp and sand the contour
Now, Rasp the contour to smooth out all the roughness that the bandsaw left. It helps to clamp the body to your workbench. Sand out all the rasp marks and your done!