Mated the Forward and Mid Fuselage assemblies tonight for the first time! This step is necessary to final-drill the bottom skins and side plates, which overlap between the two center section bulkheads. It was a bit clumsy aligning the two large assemblies to the point where you could slide these close-tolerance bolts through the two center section bulkheads and 14 spacers (per location), but eventually we got them all into place. Final-drilling the skins went quickly and easily, although of course you're doing it nestled between two tables and underneath the fuselage assembly. Once that was done, and the center section side plates were final-drilled, the whole works starts to come back apart. Not just the forward and mid sections, but all the parts that have not yet been riveted all come back to their individual pieces and stack up into a giant pile of parts ready for deburring.
Like a dummy, I didn't take any pics of the fuselage halves bolted together, I think I was "in the zone" for drilling and making some real progress after a pretty dismal couple weeks. It's ok, it will be bolted together again soon once all these parts are ready for final-assembly.
That's it for now, tomorrow if everything goes well at work I should hopefully be able to have a full night in the factory for a major deburring session... fingers crossed!