Threw up a Photoshop grid onto the image, each square divided into 5 sections so I can keep the constraints on my walls uniformed. I generally like to take up up 2 fifths of a square for a thin room wall (a fifth on either side of a square tile so that the wall doesn't each up too much of an accessible square).

Making the guides isn't always necessary, but given the amount of brick work that is going to take place I didn't want to keep confusing myself and make the walls too large, or start drawing too much into a square, etc. So the guides will at least give me a consistent size throughout the map.

Next step is doing the basic inking on top, where I'll probably add in the walls brickwork as I go... this may take some time.

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