The fire is contained within the tileset that the level uses. I'm not sure what you mean by "repair men," but EvilMike writes down any changes he needs to make to the level and then does them in JCS. It's fairly easy. The hardest thing is probably maintaining the level and taking all of the requests whilst monitoring the activity of all hotel patrons. The level is more or less standard in itself, using nothing more complex than basic triggers and the like. The hard part is being able to process many people demanding room changes at once. Reading the requests is let alone a challenge, especially when five people are talking at once.