Cut a piece of 1/8 balsa for the back of the rear deck. Trace it around mark the center line, flip it backward and put it back in. This will tell you how symmettric the back of the deck is (vertically) You can shift it around a little, put tape on after gluing and it will hold the position.

Stab mounting. Draw center line, trial fit stab tube per instructions. Cut the taper in the stab center and tack glue some 1/8 inch spacers. Check alignment. Alignment was perfect with the wing tube. The benefits of the laser cut fuselage. Mark center ine of stab outer tube and then glue in place, making sure it engages the stab rib inside the stab. Cut the tube with an exacto saw, fit the root rib in place, mount the stab adjuster by placing the wire in, drilling and putting the screws in, then grinding the edges off the other side as instructions state. Place the stab center rib on the fuselage, drill through the hold through the fuselage on each side, trial fit the stab center ribs. Notch out the red nyrod outer rod (stab adjuster screw clearance) and then glue it all in.

Done