I got the stab servo installed. I use the Pilot RC mini servos. I am impressed with the servos. They are brushless and come with a nice aluminum arm, a plastic arm, a servo connector, and hex-head mounting screws. The servo wire exits the case at the bottom. This is brilliant and makes installation very easy.
The stabs do not have a symmetrical airfoil. It is lifting. I have not seen this before. But I've seen the airplane fly and it can really pivot tight, even without the vector nozzle. I wonder if the stab airfoil helps here?
Here are my installation notes:
1. The Pilot RC servos drop right in. The openings are cut the right size.
2. The purple arms have 2mm threaded holes. The kit hardware is 3mm. I replaced the purple arms with blue arms which are 3mm. However, I could have re-sized the purple to 3mm as there is enough metal to do that.
3. The servos go in first, without the arms on. There is enough room to install the arms after the servos are inside the stab.
4. The turnbuckles are left-hand & right-hand threaded. You turn the turn buckle on way or the other to change its length.
5. Do not use the rubber grommets - they are not needed for jets and will mess up the spacing.

Of course, if different servos & arms are used, adjustments may be required.