Looks very yummy! If someone really wants to make this a 4-layer for an awesome presentation, I suggest making the standard 2 layers, then slicing them in half (making 2 thinner rounds out of each). Use the same amount of fillings, but as it will be distributed amongst 4 layers, the cake will not be too bulky, and structural stability is maintained.
Recipe >> Chocolate Strawberry Nutella Cake @ thepioneerwoman.com