Creating 3D surface from u-v lines

[tanel]

I am trying to create a 3D surface from three lines - one border profile (green) and two intersecting  u,v lines (cyan and yellow) (see screenshot below). Does anyone have an idea how to achieve this? I have attached a dwg with the 3 lines.

[parkr4st]

Maybe like so?  attached dwg

[SEANT61 · Accepted solution]

Another method would be to generate intermediate Ellipses, then loft all of those to a central point.  

[tanel]

I like the "intermedia ellpises" method a lot because the end geometry is very clean and simple. Just one question, when you are finishing the loft command, what option do you choose from the list below:

[SEANT61]

I used Cross Sections Only.  That happens to be the default, so a user can just hit 'Enter'.

[tanel]

Its interesting that when I execute the loft command I get a "Surface (Loft)" as and end result and in your example file the result was "Surface (Nurbs)". Did you do anything else with the surface after the loft command?

[SEANT61]

Leaving it as a "Loft" would allow for cross section modification at some later date, if the need should arise.  Converting to NURBS, especially if the surface is rebuilt to a lower Control Point density, reduces the data footprint to the file.

Doing one or the other sort of depends on what the eventual plan is for the geometry.