Hexagonal curve loft

Hello all,

So I am trying to build an inner volume for stair shaft for my studio project lofting hexagonal curves. I wan t be able to deform the curves so basically I need to draw them in Rhino right?! 

Is anybody here able to help me with the definition? 

Here is just the idea of what we need to do. I want to be able to control the geometry created from loft so that I can adjust it to different orientations that I want. 

Thanks,

Nilgoon