Can anyone point me to a guide for modding CM? I have the McMMM mod program but I'm unsure how to use it for replacing individual bmp files such as the rock and crater files that DK mentions in the mod section.
I'm not sure about your mod program but you can simply go to your bmp folder in your game and find file 449, rename it 449a, then drag the new 449 into the folder from your desktop.
"Most sorts of diversion in men, children, and other animals, are in imitation of fighting." - Jonathan Swift
I have managed to do Ok with McMMM. There is a link which can walk you through the process, and once you have managed it a couple of times, it's fairly easy to use.
I can try to answer any questions you may have, although I'm no pro. McMMM's creator is often on the Battlefront board, too, and I have seen him pop from time-to-time to answer modding questions.