Anyone know where to get mods for this?

I have the Dawn of the Dead mall map, and the lockdown map, but I've been hearing about a Night of the Living Dead '90 map, and skins available for this. Anyone know where to get the NOTLD map or some skins for this? What about Unreal skins? I know this game is built on the Unreal engine, does that mean that I can use Unreal skins on this game? Hell, I'd just be satisfied with the NOTLD map.