The first pair of rigging wires are in place. These are the shorter of the two incidence wires that will form an X between the struts. I propped the model up so that the root wing incidence (unalterable) was at 0. (With the engine center line at 0 the wing root sits at about 5 degrees.) Then I prepared music wires that pulled the outer (lower) wing to 0 as well. This one wire goes a long way towards locking in the incidence. The second cross-bracing wire, just makes it more sturdy.

Afterwards, I checked the incidence on the top wing and it was (as expected) also 0 at the root, but came out as 1 on the outer wing, i.e. the outer wing has a 1 degree greater AofA then the root. The solution here might be to place some small washers between the brackets on the rear strut and the wing under-surface.

*****

The P12 is a great looking aircraft. I would be sorely tempted to make those louvered panels...and in fact ALL of the panels...out of lithoplate however.