Like Abigail, I haven't really thought the inheritance thing through fully as I haven't the need for it, but what you say makes sense as far as I can tell. Once the package is initially generated it should act just like any other class (assuming you generate the right stuff:).

Perhaps the only awkward bit would be managing the process of generating superclasses if the user instantiates an instance of a subclass 2 or 3 levels down in a subclass hierachy?

use Class::AutoFactory;

my $rover = new Dog; 
# Is a subclass of Canine 
# Is subclass of Mammal 
# Is a subclass of Animal.
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Ensuring that each of the parent classes comes into being in the right order would require a fairly detailed map of the class hierachy and might be a bit complex to program. Doable, but it would require a fair amount of thoughtful design to get it right in a way that is easily extensible and maintainable.