There is no obligation to throw curtains in the places where the elevators are located. The important thing is to be able to carry both the elevator and the equipment on the upper floor. This can't be done with a wall. But it can be with the appropriate beam column system. I suggest you contact the elevator company. Or check out an elevator app to see how people are moving with connections. Design your carrier system accordingly. As I mentioned at the beginning, you should define the place where the engine and other equipment of the elevator are located in the attic. Do not forget that people will work here. You can't get a business license without meeting certain standards anymore. If you think and design the places where the rails will be connected during the vertical movement of the elevator, you do not need to make curtains. After all, I would like to remind you that there is also a vibration in the elevator, and this will not be solved with the wall. Good work. N. YILMAZ