hood scoop reinforcement and 3M panel glue?

I would use SEM structural adhesive. It has microscopic beads in it that doesn't allow over clamping. You also have a good window of application time. The SEM structural panel bond is less runny than 3m's version. I use structural panel bond on a lot of sheet metal replacement. We make some small wood strips that you can place between the clamps and the panel to avoid any bending or distortion of the panel.