Here is a custom t/dm map.
Grand Diablo
Here is the description and the download link of the map.
http://utforums.epicgames.com/showthread.php?t=629272To install, extract it into "user"/mydocuments/mygames/unrealtournament3/published/custommaps
(but im not sure) embarrassed
For more informations about install and other things, read Readme.txt