Here is the 4th picture of six. This picture shows the new top which was added to the rudder for both strength and to get the new height. It is a solid piece of light balsa which is 5/16" thick. I just eye-balled the shape and glued it with thick CA. My UCD is currently balanced at 6" so I didn't care if I added a little extra weight to the tail but it really didn't change the balance point much that I could tell.