I'm too busy to finish this history lesson so, SSTG, here is a template and I suggest you google China Wall and see where I'm coming from...
The structure on the right is a guardhouse and you could put a door to the far right in lieu of the window. The trick, is to spin the structure, using the background pic to have a 3-d view and place people on the background pic stairs as it were.
It is difficult I know and will take me a week to develop but, give it a shot! I still have the code so, if I find time, I will show you what I mean unless you make it dude!
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