when i do carbon stuff, they come out to about .007 per layer and i have parts doing 150 mph with only 3 layers so why not form a door bar and mold it in? i had one pair of small parts that doubled in weight just by painting them. I use west system epoxy and bag my parts to keep them light. Making a mold that is accurate is the hard part and takes the most time, I use matt cloth and vynal ester resin to save money on the mold. If you want to save money on the parts use a layer of s-glass sandwiched between the carbon layers. Tim