I/m a simpleton on this.

I hang a joy bubble from the Vertical stab, on the rear and align the fuse up and down so the vertical stab is vertical. Stabilize the fuse with whatever I have avail(fuel jug, landing gear blocked up etc etc.)

Place the wing tube and socket with lite ply donuts using my incedence meter across the fuse, ensuring the wing tube is straight 90 degrees to the stab. I actually like the bubble on the the incedence meter better than the measurement. Use a string or tape measure to move the tube front to back to get it staight that way.

Lastly, I use eye sight to glue the stab tube(adjustable stab) in, in respect to the wing tube. Stand back about 10 feet and you can see when perfect alignment to the wings or wing tube is achieved. Use string or tape measure to make sure it is straight fore and aft.

I use adjusters on both the stab and wing so getting the incidence correct is not crucial as it can be adjusted during final assembly, as long as it is in the ball park.

Ed