Following the photo guides, fitted the cabin sides to the REAR fuselage. This required trimming the longeron on the cabin side. It was a tight fit but both sides were matched to the predrilled holes and re-drilled.
At this point the fuselage takes a different angle. It is right where the landing gear fits. By having prefit the cabin sides a lot of future trouble will be avoided in handling the cumbersome forward fuselage assembly. (It will be awkward enough as it is. This caused a need for more deburring and corrosion treatment.
Everything is in parts now. The next session will be assembly.