Since my last post over a year ago (gasp!), nothing much has happened on my RepStrap. I got stuck at trying to mount the Z-axis threaded rod in such a way that it wouldn't just fall down, and then suddenly I got hired by Google and moved to München. Since I haven't had the opportunity to get all my stuff down, no further development has happened.
However, München does (now) have a maker group, FabLab München, of which I am planning to become a member once the last moving woes are over.