Hi all! Here’s a quick update, since it’s past the end of May 
I’ve been able to progress on this pretty steadily despite a scarcity of time. The technical debt from the prototype is mostly paid down, so the module has a sensible structure, proper command/event system, etc., and the alpha is close to ready (I’m hoping to start it sometime next week). Some of the planned alpha features have been bumped (either to a second alpha or to the beta), but the core features have been expanded and refined in a way I’m pretty happy with. I’ll update the public feature list once the first alpha is out, in case anyone’s interested in following along.
Right now I have a decent group of people interested in the first alpha, but I could add a few more, so let me know if you want to get involved at this point. This is also the best time for big feature requests, as the interface is still finding its shape, so post here or message me if you have any ideas, no matter how outlandish!
Existing alpha testers, thanks again, and I’ll be in touch shortly by message.