mounting a glass hood scoop on a steel hood
Last year I added a fiberglass scoop to a metal hood with pop rivets about every 2 1/2” then used Bondo to mould it in. The rivets aren’t perfectly lined up because I tried to hide them on the bottom side of the hood.
Used this method back in the 80’s on a different hood and it held up great.
However you mount it, make sure it will not flex.