Finding time for the project is super difficult. I will keep watching. By the way, what frameworks that you use? I know you use NodeJs and RethinkDb, do you also use Websocket for bi-direction data? What Websocket framework?
From reading the documentation. Looks like the project also use Polymer on top of Vue. May I recommend to not using too many tech stacks for the engine. Too many tech stacks add learning curve to developers. Honest speaking, none of frameworks you use I have previous experience, finding time to absorb these frameworks would be challenge.