Yes tricky but I had this sort of curves result of an multiple offset ;)
(of course I can make it by hands
Array / Curve a perpendicular line, Move each curve on these lines, and then each rotate them along the lines... (that I made for draw the result wished !)
but... :)
Ot there is an another trick ? :) (sure in this case I can make a Sweep with the first and last curve well oriented but not sure that i Obtain exactly the same
and this don't work if i had totally different curves along the parth !