Bit of blatant pimpery.
A friend has been working on a UT2K3 mod called remote strike, basically its a weapons mod that adds some more fun to the game. Latest release includes a terain deforming weapon that lets you build trenches and fox holes. It works as a mutator so is nice and easy to play with and thers something slightly funny about being chased by a gun that plays bugle tunes. Anway link below give it a go
Link
All the best
Flibb