AI have a customer asking for a baby belly cake & I haven't made one of these yet. Is this cake just like any other cake in the sense that it can be made as large or as small as needed? Or am I looking at only getting a certain # of slices out of this. I have seen where you can build on top of quarter sheet cakes for height. Also, what's the best size hemisphere pans to use for the chest to belly proportions? Thanks in advance for any advice!