I tried setting up ionscale (https://jsiebens.github.io/ionscale/) an open source implementation of @tailscale's backend, but I got bogged down in lack of docs and panics (https://github.com/jsiebens/ionscale/issues/63)
It's a real bummer when good well-meaning #FOSS projects do so little with docs that the value of the code is locked away, unusable to anybody who doesn't have a ton of time on their hands to figure it out.