As far as I can see, Dynamicland is not open-sourced because it's a building and community exploring new ways of thinking and learning collaboratively. These collaborations involve novel interactions with physical things. So far, this has nothing to do with something that could be open-sourced on GitHub. It just so happens that this new way of collaborating with physical things involves giving them access to computation.

I know this comment will seem pedantic, but I hope it also communicates that the goals of this research project are different than you seem (at least to me) to consider. Bret Victor's goal isn't to design a system of projectors and cameras that run code on pieces of paper (just like Engelbart's goal wasn't to design the mouse). At a certain level, Bret Victor wants to explode our concept of computing.