Previously known as ctf_micnax_72, this is the map I made for the 2012 72 Hour Mapping contest!
The general plan I was aiming for was to have a Gorge theme based around a small valley with a trainyard, playing much like DoubleCross while avoiding the main problems contributed with Capture The Flag maps.
Time allowed: 72 hours
Time spent: 34 hours 13 mins
Versions before final: 5
Original layout: http://i.imgur.com/Cxt32.jpg
Complete build progress video: