I came back to salem after few months and now i'm on defence planning stage.
I figured out something like this scheme:

Left site - inside base. Right side - outside.
Green - plank fence
Blue - stone hedge
Red - Brick wall
Orange - braziers
1. I heard that stronger fence when placed with 5 squares space btw weaker one behind, won't make splash damage backwards. That's why i put second (outer) ring 5 squares in front of weaker one. Am i right or should i make more distance?
2. Also, i hope is true, that weaker fence wont splash on stronger behind. That's why i put Brick-Plank-Stone on outside ring.
3. I'm going to place torchposts, dunno where yet. Probably behind "inner" plank fence. They should have enough range to shoot someone attacking outer ring.
4. Those single squares in a middle of braziers are gates. I'm going to split "brazier" ring in segments to make braziers disabling harder. What do you think about that idea?
I'd love to hear any ideas to improve or change my planning. It will cost me a freakin lot of work, silver and private time. I want really strong fortress, not a crapy designed base with hundreds of leaks and weak-points.
Be welcome to advise!