Originally posted by vinyblaster:

While the general rules of building are fairly simple (ie sturdiness is determined by the shortest path from a part to a foundation) they become a bit more complicated once you start building with stone. Stone blocks cannot be supported by wood so it can be tricky to build say a stone ceiling for the floor of the second level for example.

Wood-iron beams are a great solution for this. When stone touches wood-iron it s treated as ground (blue) .

Big castles require wood-iron framing.