The standard wingnet rail is 50mm alloy tube with a 3mm wall.
I decided to make a wing shape for the rail so it would be more comfortable to sit on.
I drew up a modified wing mast shape, laminated some corecell foam and Mark was good enough to machine it to the shape on his CNC machine.
It was then sheaved in 4 layers of carbon and a light layer of glass.(All under vacuum).
I was very happy with the result as it came out the same weight the alloy would have been.
Below are a couple of pics.