If you do a bit of searching on wooden smithy floors, there are some threads that reference the vibrations from the hammering. If your anvil stand is just on the floor, the whole building may bounce, but if you could somehow get the anvil stand on the real ground underneath that would be better. I'm trying to work around this problem as I am trying to design a smithy that will be built on skids. But then again, I'm only 18 so why would you listen to me???