So, here is the new and improved set!
The stairs to help make the basement clear as a bell.
The above in white for clarity, please note the reshaped window.
From House right...
And the same in colour. As you can see we have lost the wooden wall, it does not make sense with the stairs.
And a plan view. As you can see there is really not space for a hall way, which is why I went with the curved stairs. also they feel exotic and a little medieval... hopefully in a good way!