Looking a lot better now!

Yes, I think the walls would work very nicely for ruins too.

If the stepped outer surface was full regulated, it would also work for buildings such as ancient Mesopotamian temples, which had deliberately constructed outside walls that had this kind of "vertical recesses" patterning all round them. I've had to draw these before, both by hand and on computer, and it can be pretty tedious for a larger building plan!

Is the structure intended to be open to the air, or is it meant to have a roof? The internal shadows work nicely for the first option, but not the second (internal wall shadows are too strong). Also, the interior doors appear to have no shadows.

As this isn't a dungeon, some of the structural features don't work too well. The two enclosed spaces without access-ways need rethinking, as do some of the wall-narrowings where there are doors. They're both abnormal constructions because they're wasting building stone unnecessarily. Now you might say that the layout has to be this way for religious reasons, which would be fine, though in reality, things like the enclosed areas would end up with at least some rubble in them, and a lot of plants growing there, unless someone goes in very regularly to clean them out. By climbing over the roof or along the walltops, down and back, lugging everything they've cleared away with them. So not a popular job then...

The group of trees seems oddly lonely, unless there's some specific reason why there are so few in just one spot. In a swamp setting, that really wouldn't be likely, again, unless someone's deliberately, and very regularly, clearing the other greenery away.

That 22-foot Roman Empire map is the Peutinger Table, aka Tabula Peutingeriana, and the Wikipedia page includes a high-res complete image of the whole - may take a while to load, however, as the full-size JPG is about 15 MB. This is the direct link to that Wikimedia image.

Ralf did suggest at the end of the stream that there might be some additional symbols forthcoming for this style, so aside from the obvious "Yes Please!", I'll hang fire on suggestions until Sue sets up a discussion for that, I think.

Great live stream, as usual, in case anyone's thinking of catching it as VOD afterwards.

The edge striping makes an interesting feature on the map, but it is much too dominant - compare with the mountain sizes, for instance. I've not done much experimenting with this kind of striping, but I'd suggest reducing the number and visual strength/density if you decide to retain the effect.