The thickness depends on the panel, and the curvature of the part. Different weights of fabric will also change the amount needed. For something flexible like the bumpers, 6-8 layers of 6oz fiberglass or carbon fiber would probably be sufficient.
The mold will be difficult to make of the bumpers, because they are flexible, and have sharp 90degree corners (around the edges). You don't want to have a distorted mold, although since the final product will be flexible it probably won't be a huge deal.
What is your goal for this? Weight savings?
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