Great work, this looks very cool and seems to work well. I hope one day to see a local backup option, as it's important to me that my chats are not lost.
His comments on anchoring virtual tools in physical space reminds me of the work Microsoft was doing with Hololens and Windows Mixed Reality. If I recall correctly, there were APIs for anchoring things in space.
I recall stumbling upon those too in the Win 10 mixed reality API docs. There were a lot of interesting things in there that never really saw the light of day/any significant use