I would like someone to please explain how to make the cover of the book "hang" over the edge of the paper. It seems to me it would just fall over the edge of the cake??
I just did a book cake using molding chocolate as the cover. I found that since the cover of a real book only goes over the pages maybe a 1/4 of an inch that the MC did not droop. If you use fondant I think it will be even less of a problem. Just make sure the cover only hangs over the edge of the pages a very small amount, as with a real book.
I cover a piece of cardboard (like a cardboard cake board) with fondant.
If you are still a little apprehensive, you can also set up a piece of cardboard vertically under your fondant until it sets up. Good luck, this is a really fun design.
You can also use gumpaste and let it dry until it's hard.