OK, I am looking at the drawing and yes, the rudder goes all the way to the bottom of the fuselage. However, the drawing also shows 1/8th sheet extensions to the fuselage fairing into the trailing edge of the rudder. The rudder is only 1/8th sheet and this allows the fuselage to be wider back there for the elevator horn assy and also make the rudder less prone to "hangar rash". The builder of the subject model may have simply left them off. Any idea of when this model was built?? If you would like a copy of the drawings, I have several. Here's some info on the model. About 55" span, 576 sq. ins wing area. Mine uses a Magnum 36XL for power. I think it would go really well with an LA 46 up front.
Don