i gotta wonder, how many people have ever actually worn out a riveted aluminum boat. i know they aren't quite as durable as welded boats, but you don't see many with much more structural damage from wear and tear other than a few loose rivets, most of the time.

my river jet boat is riveted, and weighs about 300lbs before the motor and gear. you won't hear me complaining about the cost of a day trip!