[PKP Core] How to customize 404 page and integrate it to the theme without modifying the core?

[Vitaliy]

@ErwanBo

one can simply modify the /lib/pkp/classes/core/Dispatcher.php and replace the line “header(‘HTTP/1.0 404 Not Found’);

Have you tried to do it, e.g., from a generic plugin. Say, extend Dispatcher, override handle404(), hook into Dispatcher::dispatch and replace the dispatcher with the extended one through $request->setDispatcher()? But I must confess that don’t know if it works.