Multiple loft from grids

Hello everybody,
I hope that this problem will be easily solved, I think it is due just to my inexperience with lists but I don’t really understand what I am doing wrong.

My idea is to create for each line a loft between the three circles, the two at the ends and the one in the mid section. Each circle is determined by a remapping so the diameters are all different. The number of circles at top level is 230, in the mid level 670 and at the bottom 242.
Do you know how could I create the surfaces that I have in mind?
Thank you very much, if you need some more details I’ll answer as quick as possible


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