Hi there, please note that the floor plans you have sourced above, which is from us, is not to scale. Those plans are traced from the fire escape plans displayed next to the lifts, we took photos of them, cropped and adjusted to trace, the final result might not be completely accurate due to various factors.
And for the station outline you should adjust the existing one (https://www.openstreetmap.org/way/570883634) rather than creating a new one.