Good idea Charlie!
(I’ll post replies here since that’s your preference, appreciate your TT heads up as I am only watching that these days normally)
I think the “lock” of two people in the same file will get hung up by the fact that there’s not a file-watcher built into node.js (like there is on BOB). I say this hoping I’m wrong! Maybe whatever this “google compute engine virtual server” thing somehow doesn’t need that? Very curious to watch how your efforts evolve here.