I would be careful with this...If it isn't pieced together perfectly you might get sagging and bulging because of gaps between the cakes. You can get a 12 inch cake pan at walmart for less than $10. Then you wouldn't have to be as concerned.
Yes, you can piece together 4 6-inch squares. Make sure you trim all the sides that will be touching so they are perfectly smooth and can fit snugly next to each other.
No, it won't hold the weight of the 8 and 4, but neither would a solid 12-inch square. Your dowels (or whatever support system) bear the weight of the upper tiers, not the cake below. ![]()
If 2-layers each, a 4/8/12 square will serve 8/32/72 = 112
If 1--layer each, a 4/8/12 will serve 4/16/36 = 56
I think I would just do 1 layer of cake for each tier in a situation like this. But that's just me! Good luck!
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