As I grew, I would put plans that I felt safe and secure in changing to my taste, simply a bit, here and there. So why simply limitation yourself to developing furniture? Chairs are typically neglected woodworking tasks.
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)