Hi Michael.

Thanks a lot for the prompt reply!

Well...I too have considered a solution like the one you told me but for what I've simulated manually it seem not to work and also
maybe it's a little bit more complex than the solution I have though.

For example, using my example scene if I select all curves and apply a single PlananrSfr I get no useful resulting surfaces.
I mean that I can't get the main surface with the holes inside, but only many separated surfaces from each input curve.

Please check this brief video if you can : http://take.ms/QtaWo

Here you can get the example scene file : http://take.ms/uO3Eu




Thanks for your support :)