Download:
http://www.divshare.com/i/4572687-4c9
A Nexuiz folder.

I edited the original App and Pack Installer to include Nexuiz.
Mount MacRadiant1.4 INTEL.dmg
1ST RUN the Packs Installer

Make sure to select the Folder for Nexuiz. (Example: /Applications/Nexuiz )

Click Cancel for all the rest.
Then Drag and Drop the MacRadiant 14.app into Applications.
Now Run MacRadiant and you will see a warning click continue and then Close.

Now Relaunch MacRadiant and you should see this:(If not you click the Combo box and select Nexuiz)

Now you can make or edit maps:

TO COMPILE ANY MAP TO BSP:
Edit --> Preferences --> Other --> BSP Monitoring :
UNCHECK Enable BSP process monitoring
This won't tell you if there is a leak in the map
then select Bsp and which one you want to use to compile.
the one I suggest is:
bsp_Q3Map2.ppc: (final) BSP -meta, -vis, -light -deluxe -fast -filter -super 2
once selected it makes a script to use.
Now open terminal and run:
~/.radiant/1.4.0/qe3bsp.sh
OR Use q3map2gui in goodies folder