The air defense covers all other defenses. The mortars cover all defenses and resources. All other defenses covers close to everything. The spring traps seem to do well taking out Giants. The Elixir storage is a bit exposed. These could be swapped out if you have more of one than the other, but I find myself usually trying to protect my gold. This works pretty well for me against nearly all players my level and had held it's ground against some higher. Those dragons though :(