I suspect green became the default sewer-water option as an easy way to differentiate it from the blue "ordinary" water which didn't involve anything too "realistic" (given blue as normal water isn't realistic either, of course).

And are we calling these the Sue-ers now 😉😁!

My email about this arrived around 6½ hours ago now. Resubbed already, naturally!

Not a map as such, but the cast terrain company Dwarven Forge do a range of sewer pieces for their "Cities" models, which might provide some pseudo-medieval style inspiration. This link is to their main, fully hand-painted, set, and this is the main image for it:

For ideas on what sewers can sometimes look like, you might care to watch the latter stages of the 1949 movie "The Third Man", or dig through the nearly 100 images relating to it on the IMDb site here, if unfamiliar. Many of the sewer shots were from actual locations under post-war Vienna, although some (notably those with Orson Welles - where you can actually see it's him, as many of his shots were done by a double) were mocked-up/recreated in the studios later.

Glad we got that sorted at least! I did know about the hotspot disabling, but wasn't online after you replied yesterday. Thankfully, we always have Monsen 😁!

When you hover over the "Open PDF Mapping Guide" words, do you get a "pointing-finger hand" symbol on your cursor instead of the usual arrow one? I ask, because you mentioned the hotspot does not seem to be active, and that you "assume" this is what you have to do, whereas the change to the pointing finger cursor icon ordinarily confirms it's where you need to click.

I think Adobe took over half a minute to open my mapping guide, but I find the Adobe Reader startup is often pretty slow from "cold" these days. (Too much unwanted and unrequested Windows clutter that keeps getting dumped on my system, I suspect...)

This is based on a download and installation done within the past twenty minutes, incidentally (so around 17:15 UTC on Dec 2).