This junction is the bottom of the F-706 bulkhead where the elevator bellcrank goes.
I'm looking ahead and see a future riveting problem. The holes that will attach the F-727 center baggage ribs are very close to the F-729 bellcrank rib The rivet manufactured head overlaps the F-729 rib and result in not sitting flush with the F-708 bulkhead.
Also, the top larger hole gets a one sided platenut. The F-729 rib is also in the way of this platenut.
