Hi Stav, also attached here is an example of the kind of layout you would need in order to do a network on this.

But I'd think that probably Sweep would be better for you anyway though, the way that sweep works is by sliding the profile curves along the rails, because of the way it works the shape of the profile curve is rather more rigidly maintained throughout the generated surface than Network.

Network is sort of more like putting a membrane on the wires, the generated surface will have a certain element of slackness to it when it is in areas in between profile curves.

- Michael

Another networkable sample attached here - this time with 4 curves in both directions, that controls the shape a bit more, not as much slackness in it.

- Michael

And then one way to introduce the flat piece is to take your full ring that was initially built with it all smooth and not flat end at all, like this:



Then draw in a line in the top view, and use it as the cutting object in Boolean difference or Trim to slice a piece off:



That will now get you a flat part, if you wanted to control the exact outline of that flat area more, you could draw it in with some space around it:



Then select the edges and use use Construct > Blend to put in a smooth connecting piece:






When you have a shape that looks like a continuous smooth thing but then that comes to a sudden end or change in shape, it can be good to create by making a larger smooth piece initially and then cut some of that smooth piece off rather than trying to construct the initial surface right directly to the sudden change spot itself...

- Michael