Hi Lars, if you want to emphasize a clean edge on this model, you can draw in a couple of lines here:



Then for each one of those you can select the line, then run Construct / Sweep and select the edge as the sweep rail. That will create this kind of a thing:



Is that the kind of thing you are looking for?

To finish this up you will need to manually create the outside surface - it won't be a surface that is a constant distance away from the existing one so you wouldn't be able to use the Offset or Shell commands to create it, you will probably need to put in a bunch of sections and use the Network command to build it.

But I'm not sure if I understood what you are trying to do.

- Michael