This is a battlement wall. I built it to be staggered along the perimeter at points as opposed to run completely around an entire base. (Less to repair after events and/or daily mob interactions). It could be extended easily enough however, if you wanted to run it all the way. Might take a little playing with to make to ends fit but it is possible. Only a small(ish) amount of iron in this to hold the stone second floor tiles in place securely.