I have seen a lot of people try this using rivets, fiberglass and body filer(bondo) and it always cracks. The only way to do this correctly is to use 3M panel bonding adhesive and clamp about every 3”. I use clecos, but if you dont care about look under the hood you can use rivets. Before bonding sand both surfaces with 36 grit and CLEAN.
The only problem with this is 3M bonding adhesive is around $50 a tube and the application gun is ~ $30. So if your only doing this once, it may be cheaper to just buy a glass hood.