Idk how to extrude line on their own axis

Hello, I have problem with extruding curves,
So, I need to loft curves to get same result as on the picture:


Problem is my situation a bit diffrent and curves are not lying in on axis,

How I understand solution to the problem:
I have to move all my curves in their own Y direction (in my case), in distance between to neighboring curves, and then loft the one to another or extrude,

But I cant understand how to move them with their own axis and how to add to length to axis direction

Sorry for really bad english but I tried describe trouble maf_f.3dm (388.0 KB)
as I can maf_f.gh (27.4 KB)

In the picture is not loft; but extrusion used
and your file is different ; the distance between curves is not fixed; and please move your lines to the center of the grid and remove duplicate curves