As well as this they have also posted that they are actively recruiting level designers:
The Nuclear Dawn team is looking for 1-2 level designers to produce maps for the initial release of the mod.
* Examples of previous work required
* Experience with the Source Engine and game modifications is required
* Expert knowledge of Valve Hammer Editor required
* Ability to create own textures and props is a plus. We've got quite a library of excellent ND assets to choose from as well.
* Experience with SVN and TRAC is a plus.
Visit the thread on their recruitment board to find out more.