M.B.
You can bake cakes in cans.....
http://www.the-baker-chick.com/2012/03/07/mini-tin-can-bi...
http://www.ehow.com/how_###-###-####_can-black-forrest-ca...
Just google "cake in a can" and you will find lots of ideas!
You will need to use dowels down the center of the cakes to keep it all together, but I don't know how tall you can make it. After the cake is baked, you put the dowel down the center to help support all the cakes.