Might give this a go.. might not finish as well...

I was thinking of a canyon where on the edges of the cliffs are houses and connecting between two cliffs is a web of bridges and wires.

why anyone would want to build a town inside a canyon I do not know...
maybe they like the fish in the river below, or maybe they just like how no one would bother them because no one would want to go walking in a strange place that looks like it's going to fall apart...

This place would be pretty high up in the sky so it would be windy and the houses would most likely only be made of wood
There would also be one tunnel leading in and out of the place.

also... what can you do with a curve that you drew on a live surface? you cant use it for the extrude along curve thing with polygons...