Here are my very first baby steps building the "evil" side of town.
Making the evil side work as a night image is going to be a grave challenge. I asked the author if there were any haunting light sources I could add. He said no, not really . . . but I may add them just the same.
Next step . . . let's destroy some buildings!
As I mentioned above, I'd originally thought this double map showed one town at two different points in time, the first a when it was a thriving farming community, the second after it had been abandoned, become overrun by nature, and taken over by evil doers. Then I read the manuscript and discovered the two towns exist at the same time. The evil doers built a duplicate of the town for nefarious reasons, and the duplicate is falling into ruin and being overtaken by the wilderness. (The adventurers go underground, bad things happen, and they come up in what looks like the real town years in the future. They don't know they're only a short distance away from where they're supposed to be.) So some major topographical elements, like the lake and duck pond, don't exist in the second image.