Since I was in the process of building my daughter a loft (http://ana-white.com/2012/12/camp-loft-bed-stairs-slide-and-fort) and she was getting a doll for Christmas, I wanted to maker her a bunk bed for her dolls. This was an easy project that I felt I could tackle in a short time period. My daughter loved both this and the loft, so it was worth it.
As mentiond in the comments (which I read too late), there's a couple things wrong with the shopping list and cut list (you need 1 more of each board, and there should be 4 1x1 at 19"). Since I couldn't find any 1x1 and I don't have a table saw to rip it, I bought 3/4 x 1/2 trim, and that worked fine for me. I used 3/4" foam for the mattress. The pocket holes worked well, but be sure to glue also, because since there's only 1 screw on each side the boards will twist.
The only thing I would do differently if I had it to do over again is to make it a little longer (maybe 20" or 21" instead of 19"). It's a snug fit with an 18" doll when you consider hair and shoes.