We got an idea to spawn a small staticshape and delete the ground, with the staticshape being the only surface to build on.
This is what we created:

Notice the plates, and how we made connecting baseplates holding everything together?
We're planning to make a city using this concept, but so far we've only done the central plaza.

This is the invisible staticshape, what's holding the entire plaza.
We're still working on it, and therefore we don't have that much pictures.
Credits:
Kenko for getting the staticshape and building
Solitaire (Tudoreleu) for building most things
and other people who joined our server and did nothing at all