I've cut the rudder and elevators twice now. Both times I've finished the accepting groove with lots of sanding and file work; and both times have built up the insterting part of the rudder and elevators with epoxy putty, then sanded them down to fit in the other parts.
It comes out 'ok', but doesn't have that look like it was always that way and couldn't be any other way...if you know what I mean :)
What other build up techniques are there?
QT