Anyone have any experience with this?
There looks to be a legit maker in Quebec, MotoComposites:
https://www.motocomposites.com/
Offering this piece with several options (gloss or matte, plain or twill weave):
https://www.motocomposites.com/products/alternator-cover-in-100-carbon-fiber-for-moto-guzzi-1100-sport.html