You can't use OpenArena as a base for something written in Godot. How do you expect that to work? OpenArena is written in C. I guess you could go through all the C source code and copy the exact functionality of OpenArena into a new Godot project, but at that point, why not just start over from scratch? Why meticulously copy all of OpenArena's particular quirks into a Godot project when you can just start from scratch and get a better result in less effort, or keep it in C if you really want to use OpenArena as a base?

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