Molding in a hood scoop

Why go to all the trouble of making a fibreglass inside flange? Wouldnt aluminum for the inside flange make the whole area stronger?
what u r doing is is altering the scoop so it is a bolt on useing the same material . the problem you deal with when you bond a scoop to a metal hood is you have too diffrent materials metal and fiberglass that with the change of tempature heat and cold will expand and contract diffrently and add in the vibrations over time stress the bond and it cracks .