CakePHP 2.1RC: How to set a custom layout when using ExceptionRenderer

I'm trying to override default behavior of CakePHP when someone hits
URLs like http://localhost/SOMETHING_NOT_VALID

I added a subclass of ExceptionRenderer and added a
missingController() method. That plumbing all works fine and dandy. If
I do an echo(), the output comes out just fine. However, I have two
questions:

How can I use a custom layout? In my missingController() method, I
played with setting $this->controller->layout, but nothing happened.
I noticed a 200 gets returned now. I still want to have a 404
returned. How can I keep it so that a 404 gets returned?
Thanks in advance! :)

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