Hopefully the bottom rib assy and stiffener are not corroded.
You have a bit of a sheet metal project on your hands, but it doesn't look complicated at all. The rudder has to come off, then remove lower rib, drill off damaged bellcrank, treat all alum surfaces, primer, then install. Looks like all rivets can be done with access to both sides, blind fasteners not req'd. One day job, if nothing goes wrong/no surprises.
