Hi urban_h - also one other note - when you're doing a network over a grid like that usually it's best to do the network as one big piece instead of in separate chunks.

It looks like you've got a big grid of curves that Network can handle, so you can just select all those curves and do one single Network to build one big surface instead of only doing 4 curves at a time.

Network can take more than 4 curves, as long as they form an overall grid pattern.

- Michael