Hi davide76,
Thanks for the feedback. There’s a lot here that is different from how Rhino currently works. My very first thought was to use Grasshopper. This wouldn’t be a modal dialog with defined feature settings but it is an option and can be very flexible. Another thought was using Sweep and Mirror back to back with history enabled. Have you tried that? Here’s a sample of what I mean… SweepMirror_History.3dm(269.4 KB)