The trick is to mill both boards at the same time with your router, so the edges mirror each other. Bowed or not, they’ll always fit tightly. The router makes quick work of jointing two boards at once.
The Yamaguchi Platform Bed Frame in Honey Oak - This Japanese style platform bed is constructed with interlocking frames that requires no brackets or screws for easy assembly. Absolutely love the concept here, I will totally have this in my house.