I am doing a wedding cake for my nephew and niece-to-be and I gave them some ideas that I thought I could pull off and the one they picked a square with 4 layers.  12,10,8 & 6 inches   What I didn't take into consideration is how expensive the cake pans are and how I should have purchased them over the last couple of months instead of waiting until the last minute.   I purchased a 12" x 3" fat daddio pan for $25 and I have a square 8" pan already.      Is...