That looks very elegant despite the DIY and low cost approach. Good job!
I love your attention to detail and user experience, and the fact that you are releasing the design as open source. I'm interested in the ergonomic aspect for this kind of devices and the solutions and ideas being shared here are very interesting. Actually, I love almost everything about this thread
But one thing has caught my attention: the need for original/editable/source design files in order to do this without reverse-engineering. I think this topic deserves a thread on its own, to be further discussed by the community and the Eve team.