I am not sure...........hopefully someone will read it if we keep it visible and have an answer. Good Luck!
Depending on how much cake you need... I would make the base of the ball cake and to "top" part of the ball out of Rice Krispy treats molded in the sports ball pan. Cover with icing or fondant the same as the cake.
So the top isn't too heavy and can be propped open... does that help?
Have not made one before, but I think I would try putting the top half on a cake board and use several dowel rods positioned behind the character so they are hidden. Do you need the top half to be cake or could you use styrofoam? It would be lighter and easier to prop up with dowel rods. The lid of the cake in my avatar is made of styrofoam and the dowel rods are pushed into the lid so it wouldn't slide.
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