Here's another silly question. Why would you want to use the wing & tail incidence to create effectively longer undercarriage legs? To raise the wing angle to help take off the Armstrong Whitworth Whitley bomber of WW2 used a heap of positive incidence on the wing instead of longer legs which would have the same effect. Of course they had to add a heap of positive on the tail too so it wouldn't loop so the poor things spent their lives flying around in a silly nose down attitude.

If I had to guess I'd say the Nieuport would have a couple of degrees positive on both wings, the tail at zero & the engine about 5 deg down. Post another thread titles Nieuport 11 rigging angles & see how you go. Engine thrust adjustments are used to cure climbing or diving problems at high power settings. Changes to tail incidence angles to cure tail heavy planes is a recipie for disaster. - John.