That's tricky to pin down, as half the reason for my sketching bits of it over and over is to work out what sort of scale will it properly onto a mobile or tablet screen. It's likely that scale will be a little skewed, despite what I said in the leading post; something of an architectural caricature, perhaps. The trick also lays in drawing something which will look reasonably good at 960px wide, or 426px.

I've quickly come to dislike this aspect of the project.