Frames and longerons
The frames on the forward section of the fuselage that have now been riveted to the lower halves as well as the longerons.
Completing an important step in the progress of getting the fuselage riveted.
The firewall upper section had now been joined permanently to the lower half and the upper engine mount lugs have been drilled off to final size and bolted on.
In preparation for riveting aft section of fuselage the longerons (inner portion) were prepped and painted to final colour.