Custom HUD'S kind of things

[Slanderous]

If you need to replace vanilla files to run a CS, you might as well make it an IFC. The whole point of IFCs is to modify vanilla files without replacing anything, but contrary to CSs, they are slightly harder to run for the user. That is the point of a CS; they're simple. Removing that simplicity will make the CS less user friendly and more difficult to install compared to an IFC. Effectively, it's a lose/lose situation.

Also don't forget that creating an IFC can be a little tricky and messy for people that begin their adventure in the jolly world of modding. There's a very good tutorial on forum explaining how to create an IFC. If you follow all the steps carefully, you should get it to work. Then you can modify stuff without overwriting vanilla game files.