Here you see all the parts to make the rudder. You have the three balsa and two ply strips that you laminate to get the rudders outer shape. They are soaked and glued (I use Titebond) around the cardboard pattern.
The two ribs get laminated from two balsa and one ply each. Then you have the carbon fiber rudder post.
The twelve inch scale gives an idea of the rudders size.
Del