Wow blast from the past...
You'd actually be best off making a ut mod for the game, the original was stupid easy to hack, unless the community fixed that.
I wrote a cd crack for it, and fly hacked rank all the time. Mostly played legit, but tailored a couple save files, and would use the rank hack to mess with other cheaters.
Actually playing to gain tech and rank felt pointless after I could fabricate it all in a hex editor. Game was hella fun though.