I just got a last minute order for a closed book cake! They need it to feed 20 people, would a 9x13 cake cut in half and stacked be ok? Or would it look awkward?
We did an open book cake. It was two 9x13's stacked. It looked great after it was all put together. Good luck!
According to metria's cake calculator, based on volume and standard-sized 8 cu. inch servings, a 9" x 13" cake would serve 28 or 29 people (I'd say closer to 24-25, but anyway, more than you need). I just did a stack of closed books for a graduation ceremony (not in my photos yet), and each one was a 9" x !3" cake, which I cut down to about the size of an encyclopedia volume each. They worked very well. It seems like if you cut this cake in half and stack it, your book would be 6 1/2" x 9" and 4" thick. Are those the dimensions you want? Send us a picture when it's done. They're lots of fun.