Rivets: Just curious. How did you gain access in order to buck those rivets if there was no access for the original nuts, and what did you buck them against if it is fiberglass? If you used Pull Rivets, that would not be a very durable fastener for a ladder. For any type of rivets, you would need a metal doubler plate at the bottom. They won't hold tightly for long against fiberglass or wood.