Don,

if you're inclined to keeping to the built up approach, it would considerably ease the work of building to have the triangular sections laser cut as part of the short kit. As I mentioned above, the only change that I think is called for is a thicker sub fin tip section (1/4" stock) as well as another piece of 1/4" in the fin at the rudder's mid rib to provide hinge point material. This would reduce the triangular sections count to bottom, front and the 4 internal.

It would be great to see your CAD efforts once you have something you like.

I'll get back to you re the plans later today.

David.