I have a 4 star 40 that I'm rebuilding from a crash in which the stab separated from the fuselage. 4 star plans specify stab incidence as zero degrees. If I'm building the plane originally from the kit, I can probably safely assume that mounting the horizontal stab on the fuselage surface carefully will achieve the zero degrees incidence. However, given the damage incurred in the crash at the point where the stab joins the fuselage, I can no longer make that assumption. What I'm having difficulty with is determining a longitudinal reference line against which I can make incidence measurements. Can anybody please explain to me how to establish a line of reference for the purpose of measuring stab and/or wing incidence? Thanks. .. Ken