Hi Alexpolo,
I have manage to produce a good surface from the curves using the uniform 10 point network.
I started by extending the 4 outer curves to allow for the blend to be trimmed.
To get a smoother fit I added 4 new curves these where produced by projecting onto the surface
produced from original curves ( could have used iso tool ). A small scale adjustment was made to the one curve. Ran network again trimmed off blended feet and also ends.
Would be interested to know how this compares to Rhino surface.
Curve file is attached.
Cheers
Barry