Birthday Cakes Dirt Bikes How Much Ingredients Do I Need For A Large Size Dirt Cake?

How much ingredients do I need for a large size dirt cake? - birthday cakes dirt bikes

I will be a mud cake for my BFF's daughter's Sweet 16 Birthday Party. Its theme is "beach" and I used oreo blond as the sandy soil to search. I'm in a tray with drinks party. I think multiplying a recipe x 4 reg. Am I on the right track? Who makes a "Super Size" earth cake. No idea at all are welcome on the cake.
Thank you in advance.