Yeah those are kinda my thoughts too, just glass fiber filled nylon like is used in hand-tools, seems like that would have the strength and not be too brittle. I am wanting to 3D print it for now and see if ABS possibly will holdup. I also was thinking that even just traditional weave carbon...
Would anyone be interested in a high resolution .stl scan of a spoiler?
Feel like this is a part that might break a lot and someone can do a community some good with the right tools.