Q&A: Sheet cake conversion?

Hi. I want to make a 3D car cake and the tutorial I have calls for 4 sheet cakes to be made and then stacked and carved. I have only ever made Victoria sponge or madeira cakesin round or square. I know sponge is not good for stacking so was going to use madeira recipe but I have no idea how much mixture for each sheet cake, how long to bake or even if madeira would work in this instance. The sheet cake will be 9×13 inches. Or do I need a different recipe?
Thanks in advance

Answers

For carved cakes, I like using the original White Almond Sour Cream recipe, which starts with a cake mix and can be made any flavor. It is tasty and sturdy enough for carving. This is only a guess, based upon experience, one WASC recipe would fill two 9″ × 13″ pans, so if you made two recipes it would yeld your four layers.
https://www.cakecentral.com/recipe/7445/the-original-wasc-cake-recipe

Sugar Sugar by SSmiley