You gave us no timeline as to when we were supposed to have them done by, so pretty much anything else with a timeline took priority. You also made us wait for three weeks before giving us the list of levels, so it's not all that surprising that a lot of people dropped out or lost interest. Probably some of them played through the entire hack and don't feel like playing it again so soon.
At this point, I'd propose restarting the project, opening sign-ups, asking people about whether they wanted to do it or not, and taking the clips already done. Also, I'd advise not using a different forum for it, because checking a separate forum is kind of a pain. This project can succeed (especially given that the hack itself required *far* more organization) but it'll take a bit of work.