Curved parametric shed

hi everyone!
I´m trying to make a shed with GH, in which I only select an input curve and I get the structure.
These are the steps I followed:

1) Select a curve.
2) Offset that curve in Y axis.
3) Offset the original curve in Z axis.
4) Offset my 3rd curve in the Y axis.
5) Divide al the curves into equal segments.
6) Use a cull pattern with "Tue False-False True" Booleans.
7) Connect the culled points.
8) Pipe around the curves.

I dont´s know why my conections go from point 1 to point 2, and instead of keep going from point 2 to point 3, it starts back on point 3 to point 4.

I´m sending the image of what I´m getting, the image of what I want to get, and the definition in case anyone can help me modifying some parameters or components. Thanks!