Definitely unfinished, so you guys are very welcome to make it your own. I haven't been able to look at this for several years but the save seems to open okay in current versions of Minecraft. This whole process relied massively on World Edit, honestly not sure if that's even still a plugin for Minecraft but I assume that it is. The original idea was that it would be massive system of tunnels and so forth that would be used in some sort of event/challenge map but that never came to.
You can use the map for whatever. If you make a lot of progress working on it it, feel free to reply here, would be neat to see it. Using Andorhal HD resource pack in these screenshots.