I'm developing an RPG adventure map called "Tower of the Moon". It is designed by David Pulver, a well known RPG writer, and he provided some rough sketches. I translated those into an isometric map for the adventure. Here is the WIP. Still some details to add, then I'll color it.
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If your curious, here are the rough sketches he sent (on the left), and my initial attempts to translate them into isometric.
Click image for larger version. 

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