the facade will be the Firehouse. i expect this to be the twitter password maze with Ray and Peter out front bickering (sorta like the Gecko brothers in from dusk till dawn). what they'll give you? idk, maybe something like the tuck and specs card from insidious.
first scene will of course be the library ghost. could have her first appear as a peppers ghost effect shushing you. you can then have a box scare with the demented version of the ghost (box scare is a scare where the actors torso up)
second scene will be the apartment kitchen, with the eggs bursting open. a Zuul animatronic head will come out from the fridge
you can then have a transition hallway into the hotel, with the three accidentally hitting you with the proton packs.
third scene will be the hotel hallway with a slimer animatronic scare (similar to the horde animatronic in twd). as you exit the room, have a slimed peter come out through the door and say "he slimed me"
fourth scene the living room, where you can see Dana being held down by the hands on the couch. this will be a distraction for Zuul to burst through a door
transition apartment hallway with Zuul bursting through a door
fifth scene can be sort of like the exorcist room, where Dana can be seen floating above her bed, and Peter will ask for the real dana
transition street room with a insane Louis wandering, asking for the keymaster
sixth scene with the headquarters basement, where the containement unit can be seen with smoke coming out of it
seventh scene will be the streets, where the subway ghost (reused poltergeist animatronic), and the cab ghost (reused car scare effect) scare you
transition staircase hallway, with Stay Pufts hand's coming through the wall
finale room will be the roof with 2 Zuul animatronics, a gozer actress, and a stay puft head.