Walls
 

Umm, these walls don't exactly look army proof.. is this intended?
Also some of th towers are backwards. Is that intended as well?

The screens are at the possition of my settlement looking towards the walls. And it's supposed to be citadel walls (is there any higher upgrade?).

That is intended yes. Elves have such unique designs lol. Those are sky bridges. I did not make it's design though, that's all Kon's :p

So are everyone's walls designed so that their settlement can be reached without the use of siege weapons?

place the famed Elven archers along that "skybrigde" and a few guards at the stairs up. then i think the middle of that circle would be far worse than outside. mainly to the fact that the entire circle would shoot inside.