thanx for all your replies. rich, thanx for expounding on mattia's original reply. my mistake, i meant kerfing, not kerfling. the guitar is a flat top and the top end of the sides is pretty much flat and gluing the kerfing to that was easy but the other end, the back end isn't quite flat and seems to peak higher than the neck or back ends. therefore, i was concerned that looking at a finished product down the sound hole, i would see that the kerfings near the waist wasn't completely flushed to the side walls because of the slight curvature of the back. i'm not sure if that makes more sense.
but from your responses, i'm reassured that although the kerfing doesn't rise above the sides at a consistent height, this doesn't become too much of a concern because i should still sand the kerfings to match the angle of the top and back. did i get that right?