Admittedly, my head went where Lash's went first. That's Photoshop and impossible to slide one right log wall into a pair of stacked left wall logs. After about 30 seconds I thought "just stack them up bottom to top, you dumbass".Come on lash, you're better than that... Here I marked all the joints for you, they mortised the ends & then just stacked them up like Lincoln Logs.
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There is a law of solving problems. Sometimes, you just have to stare at it a while.