I have a tendency to get ahead of myself on projects.
I don't even have the exterior walls assembled (still cutting out doors and windows) and I'm working on the staircases.
Instead of making stairs from scratch, I bought two narrow staircase kits. I replaced the kit's flat railings with round ones I cut from wooden skewers, and I'm happy with the way it looks. However...one staircase has to be dog-legged (cut and angled with a landing) in order to fit.
Learn from me on this: do NOT try to dog-leg a kit staircase unless you have the patience of a saint. If you have space constraints, buy a curved or angled staircase and spare yourself the trouble.