Hello,
I hope you'll find this design very clear, as there are a lot of drawings.
For house A, there are some minor variations, which I called Rev A and Rev B, they are similar but different floor plans, the look and the section remains the same.
For house B, about the stairs, they are internal, but they are isolated from the rest of the house, so you can rise up to the open terrace without disturbing anyone, also, no one can rise above, if you do not want so.
Others....I hope it is clear.
Best Regards!