A much easier process after learning the proper steps. The right weldment went in with only a couple hours of work.

The only thing left here is some torque seal.

With the right weldment came the final bolt for the right and the left–the one hidden by the flange on the forward rib/bulkhead seen center-bottom of the above photo.

I completed some simple, careful measuring and drilled from the outside in. Both holes popped through right on target, and screws/nuts were fitted.