Reply to "Any suggestions on a better way of cutting curved roadbed?"

To save the face of any panel you are cutting  from the face side, simply use a laminate blade. 

It cuts on the down stroke.  You need to firmly hold down the Bosch jig saw but there is no need to turn the material over for bottom cutting.

If you sneak a laminate blade into  some one else's jig saw, have a video camera running.