John, thanks for the clarifications. At the moment I have 0 degrees on the stab and engine and the wing incidence will be whatever it is on the scale technical drawings that I'm using as "plans" for my scratch-built Nieuport 11. As I understand things (which is not saying much ) undercambered wings used a higher incidence angle than later symetrical airfoils.

Since the stab is connected with three screws I can be adjusting the tail incidence after the maiden flight, I guess. So ideally, the tail plane should be set to that in "straight and level" flight with the trim set to around neutral the elevator surface should be level with the horizontal stab. Is this right?