Do you have any questions about modifying the game? What will you need to do what you want to? What are the best techniques? Discuss Modifications, Map Making, AI scripting and Random Map Scripting here.
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The wood breaks it up too much. I'd stick with the all stucco one.
Also, if you're looking to differentiate more, I'm pretty sure most of the sentry towers that have Windows only have 2 on each side. The Greek one does, which you're modeling this off of yes? It also doesn't have a roofed doorway but rather one sunken in.
lol @ iPhone capitalizing Windows