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You are working in what I was searching for. I use Adafruit's Rgb color lcd with keypad to build my own dedicated chess computer based on raspbery pi called gavon.
Add the keypad to the case, Study how to attach to the case a speaker, and how to combine the case to be connected to several emergents mini pcs like raspberry, pcduino, pcduino v2... And you have built what people that don't use these devices for looking video are searching for.
Keep on with your design!!