Found this related to F-40 repair:
http://www.compositescentral.net/showthread.php?t=6026I have an F40 in our shop for work. One issue on the car is the forward under tray has a small piece of material missing. It is a carbon kevlar weave that I haven't seen before. Sorry I can't post attachments but I do have pics available. I am looking for a small piece of cloth to repair the panel. As you are aware the customer wants it perfect.....
One of the guys responded with this:
If I remember correctly, that is a harness weave. Back in the day, Ferrari was using some "non-standard" weaves.
Sounds really, really expensive to find and repair the composite materials.