I built that kit, and with careful cleanup the seam is not too bad. The key to the exercise it to test fit until the parts fit tightly together when you simply hold them together. If I recall, I managed to get a tight seam that only needed a light sanding. I used Tamiya Extra Thin cement, and applied a little pressure to the two halves once they were together to pop out a small bead of plastic that had been softened by the cement. Let it dry overnight, and sand that bead of plastic down--you should have a smooth surface with no (or a minimal) seam to deal with.
I use super glue most of the time when I need to fill a seam. Work slowly and in small sections, sand it as soon as it can be sanded, and don't leave it un-sanded overnight--it gets harder as time goes on. You can mix it with talcum powder, artists pigments, or microballons, too--it sands easier, but doesn't leave as smooth a finish.
Try it on a scrap kit to get the feel for it.
Cheers!
Ralph