Thanks for your replies.
@Michal
I was really hoping for a more flexible solution. I need this RC style mainly for exterior renderings, where I have a lot of windows at different heights, so splitting the X/Y spline is unfortunately not an option.
@Dragan
Thanks for the link to the generator. It looks really cool and has a lot of great features, but I don’t think it really fits my needs.
Basically, I only have three elements: Windows, Fixed Frames, and Doors. This is pretty easy with RailClone, where each one is a rectangle with an ID of 1-3.
I’m not 100% satisfied with this solution because the divider has the wrong width (see screenshot).
If anyone has a good solution for this, I’d be really happy to hear it.