Hi stefano, yes if I understand you correctly using circles at different stations and doing Loft could create the type of shape you want.

The other way you can make cylindrical type shapes is by having a 2D profile and using Construct > Revolve.

That looks like this - if you have a 2D profile like this:



You would select it and run Construct > Revolve and when it asks you to pick the revolve axis start and end points you would pick 2 points running down the center line like this:




That then would make a result like this:




- Michael