I asked a fellow flyer this question and was told to join RCU and ask this question here. I am building the Stingray 120. The manual says to attach cable wires to the top and bottom of the tail. I would think that would not be very attractive looking plus the labor involved. For the planes I have built I have always put some tri stock for the vertical fin and for the stab. Is there anyone here that has built this plane and give me your recommendation? Thank you.

I used solid bracing wires on mine. The idea is to keep vibrations from breaking off the tail pieces.

Real men fly quarter scale gassers.....

All joking aside "Jabby," welcome to the RCU. (I know this guy, just messin' with him).
He's a looooong time RCer (really old too) but flies VERY well!

Put them on. Not only are they needed for the strength but the additional drag they create will make the airplane fly better.

Thank you for your suggestion. I will do as you advise