The dotty fill is the grey shading. I don't think we have one like that, though I do remember showing a dotty fill on here some considerable time ago. It's not a published fill.

I found it! Wow, that really was a very long time ago. The third one here is probably a possible fill, but use it very small scale so it looks grey. https://forum.profantasy.com/discussion/7039/dotty-fills

Thanks Ede. That's a really neat map :)

I've just got the small drain or central channel connecting symbol working properly, but you've reminded me I need a bridge as well as various planks etc.

Ok, so I got a bit side tracked over Christmas, but I did make a connecting symbol. This is a smaller sewer of a fixed 10ft width between the insides of the walls.

Looks a bit boring, but I've got a whole lot of ideas about debris and creatures on the way.

The larger sewer is still in progress, so don't worry. You won't be stuck drawing everything in 10 ft tubes.

Rebalanced greys. I used the same curved wall symbol to line the channel as well as the outer walls.