I ran into the same issue that Ralf identified during the livestream when preparing my recent Monseignor District map for the Community Atlas, regarding the unscalable hatch styles, when trying to map the swamp areas there. My problem was greater though, because the area I was mapping was a lot smaller, at 10 x 15 miles.

The way I got around it was by accessing the hatch style's FCW file, and simply copying over all the constituent vector polygons, and rescaling the lot together. I then just copied and pasted those rescaled elements to where I needed them for the swamp texture, and in the forms required. This had one advantage, as I also wanted some grassland texture to represent the farmlands, and the swamp texture's polygons include those horizontal linear polygons too. Just a few more copy & paste operations.

It would be practical to use the hatch style's FCW file to set up individual symbols for use when mapping this way, so the individual pieces would be scalable like any normal symbol. Plus that would have the advantage you could also make use of techniques such as "Symbols in Area", "Fill with Symbols", etc. If you're going to be making frequent use of one of these early Annual styles, that would definitely be worth doing.

Thanks very much Remy!

Since I've had a couple of queries about the Inkwell dice sets outside the Forum, and to clarify for those interested here, the simplest solution is to visit the DungeonMorphs page of the Inkwell site. As you'll discover there, the designs are available also as cards and fonts, and there are books with descriptions and ideas for the more recent sets as well.

In addition, and because I think he actually started the whole concept of geomorphs with this ten-space design (that's ten spaces per side on the design), it's worth looking at the past postings on Dyson Logos' blog, as he's provided illustrations showing many - now maybe all - the designs he's produced over the years, including those he's done for Inkwell. There's a "Geomorphs" tab under the "Navigation" sidebar on his blog, but that only covers the 100 designs he did for a personal challenge in 2009-2010, all collected for easy download in one place. Using the "Post Categories" search box, the Geomorph Mapping Challenge has 217 blog entries, which goes WAY beyond those he's been commissioned to do for Inkwell and those 100 earlier maps!

If the gelatinous cube symbol is actually partly transparent anyway (given you can see the texture of the floor below it), items don't all need adding to the cube. As long as the items exist as symbols, they can simply be put "below" the cube by the map's creator.

On the size element, the "you can drive a cart along them" argument is partly why I suggested seeing the sewers in "The Third Man" movie, because that's where the climactic chase happens, with large numbers of police and soldiers, where there are multiple levels stacked over one another, and nobody has any problems for headroom, and places are up to river-cavern wide in parts. Somewhat like the early London Underground "tubes" (and I'd assume others built around the same time, later 19th century), some of these would have been dug out as trenches, had their surfaces coated with mud/bricks/concrete, etc., and then covered over later where necessary.

@thehawk makes a good point about ancient sewer systems. I think the earliest definite sewer pipes date to around 4000 BCE in what's now southern Iraq, at the ancient cities of Eshnunna and Uruk, although more sophisticated sewer systems survive archaeologically from the Indus Valley civilization around a millennium later (c. 2300-1800 BCE). Most were of brick or clay construction in various forms.

There is a boat at the ferry crossing landing on Ferry Road, but it's a sailboat.

Ferries don't even need to be especially boat-shaped, of course, as something like a square plank raft will do, particularly of the kind that uses pull-ropes to cross the watercourse. Some of those types were still in use in places well into the 20th century (notably the more rural areas, and on relatively narrow crossings). Depends what you need, where and when.