I would attempt to fix the vertical stabilizer in place.

A 1/8 plywood plate on each side wrapped with Saran wrap might act as a fixture. Fill the cracks with Titebond. Clamp and let dry overnight. If it looks OK in the morning use filler, sand and cover. Nothing has been lost if it does not look OK. At this point you might also consider 1/32 sheeting over the damaged area.

Bill