The Rudder, Elevator, Flaps and Ailerons are easy to set up on flat blocks because of their straight surfaces. The Horizontal Stab is not so easy because of its airfoil shape. Here is a method I have been using that produces consistent results and a very straight Stab. First step is to source 4 aluminum angles of the dimensions shown. Any similar material is suitable.
Great presentation Ed. Should be a big help.
I built two end jigs from 3/4 inch MDF board. Note that there is one 3/16 bolt and a large 3/16 cleco that acts as a pin. The entire stab can be flipped by removing the pin.