Hi MuuMuu101.
I suspect they lay up the bracing separately then bond it on with resin as a final step in production. Judging from the level of abuse the previous took while refusing to fall completely apart, I'd guess they lay down a thick coat of mat black gel-cote followed by 3 layers - mat/cloth/mat. Even the traumatized hood was still structurally sound enough for one person to handle carefully. And it remained dimensionally accurate enough to template the four corner hood pin holes from and only need to oval one about 0.25" to make the new hood slip right on. I plan to repair the old hood when I get some spare time and nice weather this summer.
Dave