Pilou,

EXT: Construct2/Sweep2 works similarly to native Sweep with "Profiles" option set to "Auto" or "Refit".
However, it is necessary to move profiles away from rail curve. See below, profiles positioned at X:999* Y:0 Z:0.

If "Profiles" option set to "NumPoints" it will rebuild Nurbs as defined by the number input (12 is default)



Does this help?
James
https://www.instagram.com/nodeology/

*I use 999 because it is easy to type, but can be anything as long as it is well away from rail curve