did you sand and run cyano glue around the edge, really does make things a lot stronger by helpinng to stop delamination. carbon is more brittle as it is stiffer, plastic is softer so less brittle. if you are making your own replacement (which you may be cos that does look like an old bosscat back end) have a look online for some carbon/ kevlar composite sheet, i have used that before and it is much less brittle while still being light and rigid, you still need to seal the edges with cyano though
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