Rolling or inducing a slight bend will make all the difference in the finished edge. One nice thing about using proseal to hold the wedge and skins flat prior to riveting is the proseal will fill any small gaps between the wedge and skin. After it's cured it can be sanded and primed. Your slight gaps are a cosmetic issue as everyone else has indicated, little micro and epoxy and your on your way.
The Orndoff (spelling??) videos had a bunch of good tips in them and this was one of them. Although I'm sure it was around long before. I credit George's videos for exposing a whole lot of gotchas way before they happen. Even on different models of RV's. Pretty amazing how similar each model is with the exception of size and canopy style. Oops, sorta got off topic!
