I've got the same kind of question , not easy to understand how things works for me ... I've never raid , never been raided
- I think that raider will always attack against one single brazier , I don't think it's possible to avoid that without overlapping. In your case raider(s) will come from the corner, break two wall-set, disable one brazier , run away / restore there biles and attack another brazier from another corner ?
- Your base have a lot of empty place (between braziers , between wall) , your defense will varie a lot according to what you put there . Is there place for a third wall-set between city wall and brazier wall ; and / or some wall between each brazier wall ? Or some stone boulder/ house like i read somewhere ?
- I don't like split-rail fence, makeshift fence at all . In fact these can be smashed really easily, no? In my point of view these takes place and can hardly slow down attacker , but I can be wrong.
I'm still living in my first-days very crappy base. If i should move (maybe one day) , I was thinking to build my base like this :

But I have no idea if it's good or not , and what to put in all those empty area

Bjebr