looking today in the homologation I find out that Carlo Abarth have homologated in 1964 all parts mayby in aluminium our glasfiber(polyester) outside the chassis /body !!!!!!!
So you can make door,front bonnet,rear bonnet,bumpers etc in this materials but weight must be like homologation form.
I am thinking to make moulding and some parts .Interested ?

very interesting indeed!! if my next project is a 2300 S again, will let you know.

This homologation document I find on the internet.