EEK! dang, my keel fell off already???????? That's okay, I don't sail anyway I just motor.
Granted, probably a job for professionals. His budget is doesn't include professional anything - I spent last March (and I do mean all month) with a power plane and grinder fixing his blisters with him; I'm pretty sure I'll be drafted to help when this one crops up.
Catalina owner site has a couple entries on how to do it from the inside, how weird is that.