Oh, boy!

I'd love to see these cities in EBII.

My only concern is that such layouts might confuse the AI, both when attacking and defending. I have found the AI pathfinding somewhat lacking even in the square cities of vanilla, so in these cities, with double walls, and unwalled sections, the AI might not know where to place its troops when defending, or might get stuck with its ladders and rams. Maybe this is moddable, though...
If it would work, however, it would give siege battles a whole new dimension.