Here is the outline of an area I am working with.

I have tried everything I can think of to create a surface or a thin solid and have had no luck so far. Sweep, loft, network. I tried to extrude it so I could do a boolean but only get sidewall surfaces (not a solid). I even tried Rhino Drape.

I think there must be some way to do this but I simply cannot discover it and need some help.

thanks,
eric