Your hor. stab is almost finished, but not quite.  Something has to be done to stiffen up those floppy balance tabs hanging off the front of the hor. stab.  
I use bamboo skewers, you can also use  a couple of pieces of 1/16" music wire in each flute.  Installation is the same, only the material is different.  
Find a good sharp bamboo skewer, and chuck up the dull end in your drill.  Now, very carefully, starting at the trailing edge, drill the skewer all the way through to the leading edge. Like so:



Cut off the excess, and repeat for the other half.  The hor. stab is done.  

Next cut out the rudder, with the flutes running from front to back, to allow you to install giant hinge points into the flutes, like so.
Be sure not to install the center hinge in such a position that it interfereres with the hor. stab doubler, or the hor. stab.  I moved mine up a couple of flutes to avoid this.  
I use goop to hold the giant scale robarts hinge points into the flute.  


Locate the hor. stab dowel in the fuselage, and cut a slot out, from the trailing edge, forward 6" just above the dowel inside the fuse, and just wide enough for the hor. stab to slide in place.  


Now, i made a mistake here, but its not a bad one.  I should have just temporarily attatched the rear dowel, so it could be removed to install the hor. stab.  I didn't,   you can.  Just put a couple of drops of ca on that piece of dowel, then remove it when its time to attatch the hor. stab.  

Now, slide the hor. stab in to the front of the slot, get it all lined up.  It helps to prep the coro around the center of the hor. stab so it'll take ca better.  Temporarily glue it in place with a few drops of ca, and use kicker to freeze  it in place.

Next, cut a couple of piece of pvc L brackets to fit the hor. stab.  Prep the fuse below the hor. stab, and then glue the L brackets in place, as shown, making sure to get the hor. stab perpendicular to the fuse, like this.
The pvc brackets are glued to the bottom half of the elevator, this helps hide them from view, they can also be screwed through the doubler, into each other, if you so desire.  I've done several this way, with no problems.
  


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