The single hit defenses are on the outer ring. Also the wizard towers are placed on the edge, with the mortars in the center this is giving a lot of splash damage to the attackers.
The attacker must break to at least 2 walls to get to your town hall, most defenses are within their own wall. Attackers must break thru a lot of walls to get 2 or 3 stars. If you are town hall level 6 there is no base plan that defends your village better than this one.
Make sure you use the spring traps wise, they are a serious defense against giants.
Our thanks goes to user about20ninjas from Reddit!
TH6 Clan war base design
This is the full layout, including all traps.
TH6 Clan war base layout
A systematic view of the th6 clan war base. Thanks to clashofclansbuilder.