I know there are quite a few pics on here of cakes that are Andy's bed. For those who have made this cake what size cake is ideal for it to look realistic? I am making this cake for my sons birthday this next weekend. I know I have to have two layers for it to look like a bed. I am just clueless as to what size cake to make it. Probably have like 30 people max coming to the party. Thanks for any suggestions.