I wonder if the Tatoeba Project needs someone or several people to maintain a history of milestones.
I started this page a while ago when I needed to know some of this information. I compiled most of it from TRANG's blog posts.
Perhaps some of this page could be used to start a wiki page that could be added to from time to time to document the progress of the project.
Maybe TRANG herself would want to do this, or already has a record that could be made more visible. Or, maybe one or two members could work on this together.
I think I'd be interested in seeing this done, but I don't really want to spend the time doing this myself.