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I think you're better off if you try this project with the dash piece for the nav unit that includes the hood. You don't need to deal with cutting up the dash and the result will look more professional and similar to stock. That's what I'm planning anyway.
Not sure about that - I got mine for free (was lucky).
Paul can probably give you an idea about availability and price. Although he said he wouldn't part out any of his nav kits which have to contain those pieces as well.