The hinge pin and tip rib have been matched up and drilled out now. I widened the inner-most hole to make room for the weld, so the parts sit flush together.

Here you can see the weld on the elevator hinge pin coming through the tip rib

Here you can see the weld on the elevator hinge pin coming through the tip rib

I also got the elevator rear channel placed and drilled out, and all of the ribs drilled with pilot holes.

One of the ribs was cut down to make way for the trim tab: