Im building the Zero alongside a bf-109e for the BoB-GB, fyi. Here are both little birdies buttoned up!
a little bit of putty was required to smooth everything out. There was a fair bit of gappage on the underside of the Zero, where the flaps met the wing. But all in all, the fit of parts is good! That was really the only trouble area, and Im not sure if it was due to the kit itself, or just user error.