I think this is too ambitious for you. There are some really annoying mistakes in your scene. For example you have paid little attention to the steps. Just count the steps and you get big problems. You have 9 steps at the bottom and 4 steps at the top. Where there is actually 7 steps at the bottom and 9 steps at the top.…
Have you started getting things into a game engine yet? If I were you, I'd probably do that sooner rather than later, just so I could make sure that I'm making things in an efficient way. I put off that step when I first tried to do an environment, and then I realized too late that I was building my scene in a way that…