Found a photo of what happened on my build trying to join wing to wing.
Notice I printed a "center section" gap filler joining strip:
Notice also that I really messed this whole thing up, my gap was about 1/4". This is the top, it was covered with a metal heat shield, effectively hiding the fix.
One of our members years ago, Jim Nunn, came up with a novel idea. In fact it was so good he posted on April 1. His version of a paper stretcher.
Too bad there isn't a paper stretcher, could of used one several times during my model builds!
Mike