When making the tail, it turned out that the front fin fairing was about 1 mm too short, I had to insert an extra scrap paper strip there. I also made a mistake in fitting the fairing before I had mounted the stabilizer halves, with the result that the stabilizer halves could not be brought up close enough to the fin, resulting in a gap.
I made some extra fairings between the fin and stabilizer from scrap paper. It looks a bit clumsy seen close-up, but it's still much better than the original gap
