Aluminum

I'm looking for a few opinions...
My aluminum is somewhat curved and doesn't want to lay flat on the side on my trailer. Specifically, I'm talking about the area beneath the window. Since I'm already going for a riveted look, I'm thinking about shooting "rivets" in the sides or installing decorative trim pieces from front to back.
I don't feel like an adhesive is an option at this point since the skins are already trimmed down to size.

My aluminum is somewhat curved and doesn't want to lay flat on the side on my trailer. Specifically, I'm talking about the area beneath the window. Since I'm already going for a riveted look, I'm thinking about shooting "rivets" in the sides or installing decorative trim pieces from front to back.
I don't feel like an adhesive is an option at this point since the skins are already trimmed down to size.