I recently did a 20×20 cake and i did 4 cakes of 10×10. If you do 4 cakes of 8×8 square inch pan, it will even be easier, as the cakes will bake evenly and you can torte and fill with breeze than a full16x16. If you are worried about the connection, spread a thin layer of icing as adhesives on the sides that will connect with each other, more often a square cake will be evenly cut and they will end up cutting on the middle where there was a connection. Hope this helps.
TheLittleCakePatch by JoWieneke
