Wild West Mod for Unreal Introduction and Why an Unreal Mod?

Hello, I am 'ProblemSolva' and this mod aims to be a Wild West total conversion for Unreal Gold. The confusing question I think people do want to know is why a total conversion for an engine that is almost 20 years old? Why not just hop on making a game using the free UDK editor?

Source:

http://www.moddb.com/news/introduction-and-why-an-unreal-mod