Having read your question and the replies I will add this. There seems to be some possible misunderstanding to what you are doing. I know I'm not sure of the replies. to me I believe you wish to align the stab to the fuselage so it's at right angles to it. Fine the most important thing is that it is exactly parallel with the wing. assuming this is an arf and the wing properly fits the saddle which they generally do. Set your fuselage in some type of holder to hold it firmly level and straight. Stand back and eyeball the stab (before glueing) to see if it aligns with the wing, do this from front and rear. This will be quite apparant if so. Of course there are more technical means but this works fine. It is very important that they do align. This is possible to do regardless of what plane it is. If not aligned you will have to sand the stand seat some.