Wayne,
Wish I'd known about your concern over the rudder. Attached, I hope, is another way to do just what you want, a removable rudder, but you could have used the existing keel frame. When (if) you receive this, make reference to point number "34. Make the rudder post . . .". Keep this on file for future reference.
Bob
Well, no luck on file attachment. Max file size is 19.5K and the .doc file is 2 Meg! I doubt seriously if it can be zipped to 19K. Bummer.