Some forums are a little futzy about linking to other forums for certain things, so I hope this isn't an issue. One of the forums I tend to frequent the most had a release of an entirely new MH map that's zombie themed. It has a few issues, I've posted reviews of it there, but overall it's an amazing map you guys might wanna take a look at.
Read the link before playing. Map's got some minor issues you need to know to play.