I 2nd what Cooperal said, though I do sometimes build stone outer walls since you can end up with a lot of extra stone after awhile. Plus it looks awesome

But the regular wood walls are more than enough since the best defense is you on offense.

I actually wish I got more raids/events, I like building defenses just for fun but they rarely get tested. Some people come talking about multiple raids at bases or during a boss fight, I want that kind of 'unluckyness'! haha