If you add the carbon fiber to the mold model in your CAD file then you may be able to use a pencil toolpath in MeshCAM to generate a cutout path. If you want to send the file or a photo to support at grzsoftware.com then I will look into it.
You'd probably want a real recent version of MeshCAM from the news section of the site though. There have been some big changes lately that should cause newer version to perform better for you.
-Robert
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)