Installation Instructions :
A clean install is recommended to avoid any FC etc.
Download and copy the CyberGR-MOD.NS.NGN_ver.2*.zip file into your Nexus S storage
Boot into ClockworkMod Recovery
From main menu select wipe data/factory reset and wipe/cache partition
Use Dalvik-wiper.zip to wipe Dalvik Cache.You can get it from here : Link 1 or here : Link 2
From advanced select reboot recovery
After rebooting recovery from mounts and storage select format /system /data /cache /boot & if you want /sdcard
From main menu select install zip from sdcard then choose zip from storage
Select CyberGR-MOD.NS.NGN_ver.2*.zip and proceed with the setup.
When done!Reboot your device
First boot as expected might be slow but nothing to worry about, its normal.After first boot, before doing anything a reboot is recommended.(fixes misplaced CyberGR-MOD wallpaper in Ver.2 too)
ENJOY!!