Hi Niko:
i downloaded your file and i found two end points not matching other curves (yellow arrows)
after moved them i did a sweep with red curves like section and two blues like rails
have a try...
i also did 3 network surfaces without moving your points,just trunk them
take a look at the file i attached
hope i understand what you want or maybe you need the corner more "sharpened"?
M-D
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