1. Accordingly with your blue print you can do like this:
2. The staircase can cutout the room (upper floor, ceiling) not the walls.
For what you need you have to use a door frame or a service hatch.
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A computer program does what you tell it to do, not what you want it to do. Murphy's Law
When all else fails, read the instructions. Murphy's Law
If you don't like "AS IS", DIY. Dorin's law
