to purchase a 1metre square piece of woven carbon fiber matting is $70au the resin to stiffen the matting is $110 for 10 litres so total cost for making a bonnet out of carbon fibre would be around the $300-$500 figure if you had the mould. I also think the $1400 price tag for a bonnet is a bit steep but i undrestand why it its so expensive due to the time consuming nature of the process.I dont think they are that much lighter than a standard steel bonnet in fact i think they would be heavierthan the steel ones personaly i prefer the standard gx steel bonnet