The center and rear sections sit on different planes. The structure flexes in the undercarriage box area - thus to get things to line up - have to elevate rear fuselage. Quite easy when you work this out - no mention in drawings. fitted the side skin and played with this until the holes lined up. Feel like I did a lot of undoing and redoing today, so progress not great. WIll have to spraypaint rudder pedal parts and prime control arm assembly tomorrow. Fit rudder cables - dont want to do this later because access would be difficult.