Tron

Hello, I have very little programming knowledge and was curious about the source so I loaded it up and built it. Going through it seemed that it is mostly C# scripts. Are these C# scripts creating the jsons? I would like to customize the GUI however using the jsons to do so is constraining. I guess the question is how would I go about doing this for the client login/main and HUD/interfaces in game via Visual Studio and where would I look? Very respectfully, Scaly