Hi,
V5
tried Sweep2rails, surfaces will not join and a mess.
Try Network of Curves tool, again do the fwd part then the rest, and will not join.
copy out to another file and try again, and a second run of the command sees it join, same curves, no changes.
Hello- Sweep2 will like it better if all the cross seection curves match in straucture - the middle one is different from the two ends. Proably better to rebuild the arc-ish parts and then join to the straights
The next one over will join if you MatchSrf the pointy bit back to the network surface.