Attic staircase layout: where should they land?

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Hi everyone, I’m designing a U-shaped staircase for an attic conversion (I want rooms there) and I need some "headroom" advice. • There’s a ceiling opening for the stairs, but it's split in the middle by a structural concrete pillar (see photos). What type of stairs can I add? • Ground Floor: Two niches. I’m planning to start the stairs in the left niche (closest to the entrance), I even added a cables for cleaning robots in the right one already • Attic: Sloped roof. I have points 1 through ...