PlanarSrf on Curves

Hi, I am trying to make solid surfaces along this modelled stair case however planarsrf doesnt seem to work. Is there any other command I can use to fill the surface in?

Could you share this 3dm file?

I think this is it
Rhino Model.3dm (103.0 KB)


Take the blue curves and revolve them around the red axis by 90 degrees.

FYI,