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I have a supply of 9 mm aluminum honeycomb but that is not as available as PEX tubing, Lexan, or Coroplast. I went to PEX first due to crash concerns as the neck is vulnerable. I might try short pieces of PEX filled with foam along with the elbows. Fiberglass was used by Craig Vetter on motorcycles but that requires building a mold. I used 1 inch hex wire mesh bonded between 0.005 in. plastic tarp material on the rear cover. Again the need for a rigid space frame. I will look into 1/2 in. foam insulation board bonded to plastic or aluminum sheet. Cloth lycra has been used and I would like to see something waterproof. Padding at the should and hip would be a plus. I appreciate the suggestions.
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