Region grid

Hi, i'm trying to convert a grid made by polylines into a region.

The aim is to remove the intersection lines between horizontal and vertical polyline

---> make it as a region and then work on it with loft and extrusion.

I know that region it is a closed polyline, i would like to know if there's a way to convert the grid into a region or if there's some component that could transform it.

I attached 2 algorithm:

On the top there's the grid i want to convert, made by a square grid and pulled by an attractor (nudibranch)

The second one is the example of the grid extrusion made by drawing closed polylines in Rhino and then converted in grasshopper

Thanks in advance

Ps: I also have a problem with nudibranch, around the attractor point it seems to make an error