Hi Boxhead sounds like you are making good progress.
Instead of rivets I used button heads in stainless.
You may recal when you were over, I have also placed the bolts through the bonnet/hood edge. Here I started at the front of the scoop and went around to the front of the scoop.
Used the same button heads here as on the scoop.
Just don't over tighten them.
Cheers
Bernie