My version of tail feathers for a Stingray 120 converted to low wing. I cut cores from white foam and sheeted them with 1/16" balsa.
This was an old Stingray 120 kit that I never got around to building.

vertical stab, before cutting out rudder.

Horizontal stab cores.

After sheeting

contrasted to the plans.

Elevators

Since the tail is now a flying airfoil instead of a plank,
a saddle is required to fit the horizontal stab.