I poked around on Nations at War at several points in its development cycle... a development cycle it was perpetually trapped in, where the moderators kept deleting the world as soon as players finished making some really beautiful and well-designed in-game builds. They also failed to deliver on any of their gameplay goals for the server, because they kept scrapping and redesigning the server plugin.
Honestly, if they had just committed themselves to doing a simple plugin and a final map before they made the server public, I think they'd have had much more success. The way they ended up doing it just frustrated and alienated their community, until the server ceased to be interesting or engaging, and it just stopped being a thing.
Just poked around on the forums, and apparently community members are taking the old maps and making their own Season 3 server, because the administrative team has all but vanished from the community. I hope they have more luck!
EDIT:
Soli, two things:
1. Please watch How Long? by HTDA and make me a skin based on the guy in there?
2. Would you be interested in helping me make a sci-fi styled texturepack with support for a few different mods?
1. I might get the wild hair to, but to be entirely honest, I probably won't.
2. I might be able to help with a texture pack, but it depends. I earn my meager pile of ducats doing digital art for a living, and it's easy to get burnt out on it. Depends on the size of the project, and what your goals are with it, I guess.