Cut out the bottom faring and sanded everything down to the scribe line. I then fit it onto the tailcone and it's in the ballpark. This is the "old style" fairing so there's no way for front and bottom to properly "nest". I'll have to do some sanding of some edges to get things to work right. Update: I noticed something when reading Dave Gamble's excellent blog ( http://www.schmetterlingaviation.com/search/label/Page%2012-08 ) : the fairing goes on the outside of the tailcone, not tucked. Now the reason for the edge marking on the tape makes sense. I never thought that there'd be an overlap IN to the airstream but there you; I rechecked the plans and, sure enough, that's a dotted line signifying the aft edge of the tailcone skin, which means the part is hidden.