The vertical fin consists of two sides and a rib on the root to the fuselage.
Since there is no structure, I added a piece of wood ( coffee stirrer ) to support the fin.
There is also a swash plate with card doublers that will be the support for the horizontal fins.
dry fit the assembly
and glued in place.
One feature I am not sure of is that there is a small air inlet at the base of the vertical fin that is missing. But that is a minor detail.
Isaac