I sliced the inner and outer skins of my hood apart at the rear, and installed a thin sheet of aluminium between them. I ended up using a thinner sheet than I started with, the first one was too stiff, and wanted to take the natural "bow' out of the hood shape.
I also added aluminium to the back-sides of my front inner fenders, and inside the
oil cooler scoop.
Another thing I did, to confuse those people with "busy fingers" at car shows, was to sand the underside of the front and rear wheel openings smooth. When someone reaches up there, they will not feel any 'glass cloth - only a smooth surface like painted aluminium. We also added a slight rolled lip to the bottom side (call me fanatical) of the fender flares to simulate how an aluminium fender is rolled over a wire frame.
I also glassed-in a 3/4" steel tube behind the dash where the "grab bar" goes on the passenger side, so I could through-bolt it into metal. Didn't want anybody to rip that baby off the dash while they are hangin' on for dear life....
regards,
Jeff