I should apologize for the mentality of my response to Doug's inquiry. I was intending to try to give some response, rather than having no response from a sparse and unknowing community; and I was trying to give a realistic frame to a completely blue sky question. But upon further reflection, the problem is that there is no known realistic frame anymore. What was once known, may have improved.
We have one person named InSaneDarwin on IRC, who has claimed to have built Darwin 10, in a matter of a few weeks. Even while he was attempting it, this feat was thought to be impossible. He was told that it was probably impossible and he said, "oh okay, I'll do that then." It would seem that various other componentry has advanced independently of PureDarwin since 2009, possibly such as DarwinBuild. Enough time has passed that perhaps the
puredarwin.org documentation has suffered from conceptual decay, and needs to be completely retested.
As part of reimagining PureDarwin, we need to throw all assumptions out the window and start over. Completely.
We need to give huge moral support to anyone who actually delivers a 'win', as InSaneDarwin and rafirafi have done. They headbutted those limitations and they ingeniously plowed right through the scene.