I shall try and satisfy your demands with a picture.
http://www.stjohninthewilderness.org/wp-content/uploads/2015/07/oms3_2_overhead.png
It shows the majority, but not all of, the second part of my map oms3_2 in a birds eye view from the editor. The first part lasts about 20 minutes, and I anticipate the second part presented here lasting anywhere from 20-30 minutes. The construction is nearly complete, with only one big area left to create and apply details to.
It will absolutely require Quakespasm and or RMQ since it not only breaks every standard Quake limit known to man, and probably some not even known, but it slightly extends beyond the +-4096 boundary. In other words, its huge.