The vertical stab is one piece, folded over. Cut per the pic, and don't forget to woodpecker the ENTIRE coro mating surfaces. There is also a 1/2 strip removed from the center. These flutes need to be opened a little with a razor, and try to keep it straight! The straightness of this cut determines how straight the vert stab will be. Remove the inside skin, and try to bring the halves together, if it's to hard, remove some of the flute. A dremel with a sanding drum on low-medium speed does a nice job, just be careful not to burn through to the other side.

The rudder still needs to be cut , so don't fold and glue yet. I need to see if my measurements will show up for the vert. stab.

EDIT: DOH! my fonts look kinda small. Can you guys see it?