Nice one Claud , the way you place it on a normal section is realy cool, try to make it a little taller, and maybe the ability to "stack" more then one over each other . this will save you the time to design a tower
I like the idea, but you said the stairs would be hard. What if you went with a ramp that was in line with the walkway on both sides? It would give it a wider base and the troops would not have to run around a wall. I know that you have scraped this idea for the time being. I just like it and thought I would let you know about it.