One thing that annoyed me with the canopy skin, is the poor fit with the frame. Basically there are void space between the skin and the aluminum structure. Some builders have rivets to nowhere, but I didn't like the lack of structural robustness.
I rolled up some play doh and laid them over the predrilled holes. I covered them up with cling wrap to avoid it sticking to the skin. I then clecoed on the skin, letting it squeeze the play doh and marked the hole locations.