Very nice map - shame it was too big.
...say, couldn't you have just genned again, with the same seeds, and just made this a 2x2 instead?
Wouldn't it be safer to eventually move the stairs over to the edge of the tower and have the path make its way up through that method? It'll make it far easier to actually access the wall to build up on it.
Also, what color are you using for your open space tile?
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::shrug:: I guess I didn't need this space after all!