All of your plans look good so far. There was one thing I noticed though: the rooms don't fit together....yet. I think that if you change your story a bit, they wouldn't have to have physical transitions. For instance, you can put, "Over the course of the years, many patients have passed through the doors of this building, the building that would prove to be the place of their death. For years, the shadows and screams that haunted their minds were the reason for their imprisonment. Now, 78 years later, the creatures and contortions that haunted their minds still roam these halls, but they're all too real. Can you go crazy and come back? Or will it be too much for you? Test your mind at [NAME]!"
Sorry about forgetting to throw in the reason for burning. It wouldn't be too hard, though, for you to take what I wrote and get ideas for your story. You've done a great job so far!