Perhaps I'm jumping to conclusions, but you seem to be assuming that perl will go load the modules by itself because you assigned their package names to @ISA. This doesn't happen; each of the modules has to be loaded via "use" or "require" first. The error message is saying the relevant packages were never defined, not that perl tried and failed to find the associated files.
Basically, The Apps::WWW::Configurators should "use" Apps::WWW::Base and the others, or "use" a module that "uses" them, or something along those lines.
