If they don't need to be edible, I would use cardboard or foam. If they are to be eaten, I would bake a thick cake and then freeze it. Then cut it into steps. Then cover with fondant. It must be frozen or you will end up with crumbly mess!
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Good Luck,
Marci
Why not do it with fondant in three pieces. The bottom step a complete square the depth you want your first step, then make another the same depth but only 2/3rds the bottom and then the last one 1/3rd of the bottom and just stack them on top of each other. Good luck
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