In the end, alinging the texture on the city wall's walkway was a lot faster that I expected.

First, I realized I could use Offset to convert the thick line into two of my polygon's sides. For the next step, I was starting to go through Line-to-path and then combine, when I realized I could draw a new poly and snap to endpoint.

Now I have to figure out what to do for a border. I don't like my first attempt above.

And I'm not used to borders. But I made the decision to place all floors in one drawing... and now I feel like it's begging for a border.

EDIT...

Still mulling it over.

I think I don't want it to use neither the street paving nor the room paving.

Got it.

Not on my computer right now, but I removed the image from my previous post.

All those interested can visit my gallery if they wish.

I wonder if I can insert an image from my gallery, so it can be displayed in a better resolution...

I'm not 100% convinced either, tbh. Luckily, I placed them in a layer of their own, so I can turn them off easily (at least while I think it through).

Maybe blur would do the trick?

...

Yeah, that's kind of in the bucket list. I don't know if I'll be able to finish on time.

Oh, and the city walls are not a polygon. They're a line. A very thick line. With an outline. And since there's no such thing (I think) as a shaded line, I'd have to redraw them. Not the most complicated thing, but I am short on time. Hopefully next weekend I can spare a couple hours to sit down and draw.

Yes? At least originally.

I'm not sold either. It seemed reasonable when I first sketched it, but it does seem a bit weird.

A bit of a shame, but not too much. I'm confident he'll actually use the products and enjoy them, so... it's a win.

And like you said: maybe I win the voucher in the competition!