The RePhone Kit comes with a square, rather small touchscreen, giving it the impression of a watch. A paper cutout that comes along with the kit can be folded to incorporate the gadgetry on the inside to give you a rather rustic looking but pretty capable self-built smartphone. However, a better idea would be to 3D print your own housing to not just add a personalized touch to it, but make it look more finished. Hey, or add straps to your device and wear it like a smartwatch that you made for yourself! More at YD.
Unusual idea. It just may work.