We built this prototype some time ago, but we never wrote up the details of how we did it, and so we thought we should share. We're happy to answer any questions you might have about the project!
Osmo iPad reflector, fits well on Mac circa 2017.
We're planning on adding more instructions to the GitHub repo over the coming week, to make it easier for people to replicate our hardware setup. Among other things, Kevin's developed a slightly easier-to-manufacture version that doesn't require a door hinge.
It's currently lacking detailed instructions and stuff, but you can expect to see more in the coming week.