Interesting that you should bring that very detail up, I do plan to do just as you have suggested, this is the only thing I have seen that I thought could use a bit of strengthening. I will use a trick I learned long ago to keep from popping a rudder off, the rudder sets into the slot you build into the stab, then this whole affair is attached to the back end of the fus.
I will add bamboo dowel pins into the rudder that will be attached to a block under the stab/fus. This should add additional strength and stability to the tail. I also thought about adding wire bracing, seen this on another Tele, but have not made up my mind. I also was wondering since I was up-gunning w/a bigger engine, which was here today, but mailman took back to PO f/me to sign, I was @ work of course! Adding wing braces? I understand if you give too much throttle, you induce wing flutter????? Any help would be great appreciated.