Hey mustangman, sorry to see all the extra work you need to do, too bad the manufacturer's not as dilligent as you are. You seem to have the situation at hand but don't second guess anything, especially stress points. bathtub caulk in the squeeze tube will work wonders blending in that dorsal fin, but you're going to need paint.
And there's no excuse for those cowl lines, that would drive me crazy because it's noticable.