When I started laminating the parts for the rudder, the balsa pieces were shaped slightly differently than the plywood center piece.  I first went ahead and glued them trying to force them to bend the same.  After a few minutes I thought about it, and wondered if I was gluing the wrong parts together so I pulled everything apart and double checked them over the plan.  Sure enough, the balsa pieces are shaped according to the plan, but the plywood center pieces were not. 
I decided to go ahead and pop out all the laminated parts for the stab and elevator and lay them out as well.  All the pieces fell out really easily.  I had to cut a few of the balsa pieces out just so that the tips wouldn't break off, but overall everything was of really nice quality.