You have yet some tools like CMorph or LineWeb for simulate some surfaces between any parts or curves...







A cool tut ;)
https://www.etereaestudios.com/docs_html/nixus_htm/nixus_index.htm

It is not exactly what I was looking for but it's a very interesting tool that I'll investigate, it could certainly automate the cross-sectionning
Thanks for the hint!

My explanations were poor so I'm adding an example in GIF format:

Hi Fred, you should be able to control the length by using the Edit > Trim command to cut longer pieces to the length you want.

Or you might also try the Construct > Network command instead of sweep, it will internally trim off excess ends unlike sweep.

Sweep is set up to use the full length of the curve so you can do one rail sweeps like this with one profile at the center of the rail:





- Michael

I just discovered we can trigger the "Add trim point" with a shortcut in Edit > Trim = AWESOME

Hi Fred, yes that's new in v4. You may have already seen it but it is mentioned in the Dec-11-2017 v4 release notes:
http://moi3d.com/wiki/V4Beta#Dec-11-2017

So with that you can set up a keyboard shortcut that also triggers different UI actions like pushing a button or changing a drop-down setting.

- Michael

Very cool . . .