If that idea hasn't already died completely, you can count me in. As said this map might be finished in 2175 but until then it should be possible to have one single person at a time do
something with GTK that others can then continue to build upon. It might not even be necessary to make a lenghty discussion about the map's theme: IIRC I proposed some time ago (when thinking about reviving the whole "pass the map" thing) to actually have people do whatever they want to stuff others have uploaded, as long as they don't start deleting brushes or something like that.
It might be a good idea to have at least a no-no list so the map won't get stuck at some point because noone wants to further develope an ambient depicting the toilet of a mongolian barbecue restaurant somewhere in Nebraska, but other than that I can well picture the process of creating a map just by doing something what you feel literally born to at a certain stage of that promo map without having to think about it two months in advance, because you were chosen to be the texture guy/detail guy/lighting guy.
Just see it, grab it, leave a note that you're going to work some time on that map for now, and then reupload it so others can do their thing to.
And even if some of us are well-known for working forever on their projects: first there's no definite time limit set production-wise, and second this method will inspire people to do something right here and right now - kind of being inspired in that one perfect moment of Alpha Stage 3 or Beta version 37 god knows what might happen.
I'm really bad at explaining somthing like this, but having one person at a time doing what he or she just feels that might be necessary to do (and not follow a strict plan like for example layout->gameplay->lightning->texture)... that could help making this project quite entertaining and not a prestige object that will determine everyone's future.
Whatever the final outcome will look like, just throwing all our ideas and/or talents into one single pot once again is already interesting enough to just do it and forget about possible bad results. If the final product is really to become a huge pile of shit, then we can still pretend it never happened
or delete every single light source and say it's a Dessi map that our damn monitors are just not able to display properly.
Does that make any sense?