I need a graph that I can print out to show everyone how to cut an 11 X 15 (3 - 4 inches thick). How many people should this cake serve?
Also I just bought the ball pan.. I was wanting to make a baby rattle cake.. Has anyone done this? should I use both sides of the ball or just one side and how many people would it serve using both or just one? Thanks in advance!

hmmmm I wonder if you could use both sides and insert a dowel stick covered with fondant and make the handle to the baby rattle? Maybe tie a bow on the end and make a ring/circle at the bottom like some rattles have.

http://www.cakecentral.com/article-print-15.html

this is a serving guide to how many servings you can get from different sizes

I'm fairly certain I have seen a baby rattle cake like you described on the Wilton site. Big sports ball on one end, and mini sports-ball on the other, with a dowel in the middle. It was really cute. I can't imagine it serves too many people though.