What type of game is it supposed to be? First person shooter or something? Or are you just going to build an environment which we can explore in?
If it were to become a game it would be a 3rd person exploration game that is pretty much open world. However, I am building it mostly as a showpiece for my portfolio and to gain more skills in environment art. This is literally the first environment I will have made unfortunately so I hope I can pick up Unreal Engine 4 fairly quick to use it efficiently. I've literally been wasting my time last semester on character and creature design just to learn zbrush. The pipeline is fairly similar to that so that is good.