Create perimeter around curves

Hello all
I want to create a perimeter from a set of curves. It should take the shortest route possible.
I think my goal is best illustrated with pictures:
How it currently looks:

What i want (behold my skills in Paint):

What I am interested in is how you would approach this problem? and if there are some nodes that i should look into?

you want to calculate something like a convex hull I guess.

Thanks! That’s it

what about if you wanted this perimeter?


I would extrude them all, join solids and then got top surface of that solid, then would get curves of that surface, et voila:)

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