neat! could u share more details please? thx

Grazie per aver condiviso questa idea attraverso questa immagine molto suggestiva!

yeagh, please can you give us a little more details?

of course :)
I'll try to explain my strategy semplyfing some passages.
For first step I worked in xy coordinates creating a rectangle 1x1 and a circle inside it. I create a loft surface (in reality it is composed by four different surfaces) and I used "SDivide" for sample the points of a radial grid.
In second step I use xy-coordinates of my new radial grid for recreate my loft surface in UV-coordinates of input-surfaces. Now I have a new surface like starting one, but with a hole in the middle (it is better to allign before this hole with point (XY) resulting from the intersection with the curve) .
In third step I find the sub-curve that connect two surfaces. I create two pipe along this curve from limit points to middle one.
At last I progressively aligned points of surfaces (with hole) to points of pipes.
I hope my explanation is clear, if not I'll try to explain some steps better :P

alessandro, i got a little bit confused, where exactly you are starting with the rectangle?

I draw a rectangle that connect following points:
{0,0,0}
{0,1,0}
{1,1,0}
{1,0,0}

I worked in a 1x1x0 XYZ-space for creating my new pattern, later I use XYZ-cordinates of my new radial grid points for recreate the loft surface along the input-surfaces.
I used a 1x1x0 XYZspace, because using "reparameterize" on input-surfaces it gives to me a 1x1 UV-space

thanks a lot

I'm trying to understand your process!
Is the final result a mesh or a nurbs surface?

There is no diffirence in the logic of method between nurbs and mesh. I tried at first with nurmbs, by creating an array of interpoladet curves, but then I prefer to work with surfaces for 4 pts (that are then converted in mesh).
It depends on what you need to do next.

Yeah, I agree with your "4 points" strategy.

Thanks

You're...
I got the smooth effect of the holes exporting like a mesh in "blender". ;)
The original mesh looks like this:

Could you tell me if using WeaverBird would work for smoothing this cool mesh from within Rhino?

- Giulio