Today I begin working on the main bulkhead, its a massive assembly that got delivered with the wings as it is paired to the mains spars. The spars will be bolted to this bulkhead, as well as the control column assembly.
To begin I drill all the holes that will get snap-bushings installed.



Here is the complete bulkhead.



The two shear bars have to be backdrilled, the holes got coutersunk to allow the wing spar to be flush-installed.



I then drill the four supports, the size of each hole is different to allow for the proper snap bushing.