Here's the dining booth/fold down bed/storage area. You can see that I tried to tie it together. The bench frame screws three of the four walls together. I was happy with the way the corner joints turned out (Cool Beds Frames)
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.