RE: big gap
This doesn't relate to your question, but noticing the small dent on the fuselage (hangar rash I presume), you could try dabbing a drop or two of water on it. The water will cause the fibers to swell, and it usually does a good job of fixing small dents like this without resorting to filler.
However, PilotFighter's suggestion's are excellent ways to fix the issue. As he said, its not that big of a deal.