You get the screen you want and you mold it into your dash like everyone else has done.
In the video, he clearly states that the molding of the screen into the dash is "a couple hourse work". I'd say it's more than a couple.
And the monitor that the Streetdeck comes with is a flip-out monitor (MTSVO-SC), according to the store. I'm willing to bet that if you contact the mp3car.com store you can discuss monitor options for your particular project.