Opinions on VFN fibreglass scoops?

There are a bunch of measurements as far as length width height which slopes, not simple. The MW is basical 30 width rear, 34 front, 37 1/2 length it slopes from1/2 in rear to 2 /1 2 front. Then there is a raised area on top to make it sturdy.
edit: of yea the dip down the middle is 4 3/8 front and 5 1/2 in. rear