Use a serrate knife to level off the tops of each cake layer for a plate surface. Slice the lemon Chantilly cake layers in half lengthwise for 4 even cake layers.
Layer 3-4 of the cake layers with the vanilla bean buttercream and (optional) a generous slather of lemon curd in between each layer. Add a layer of buttercream on top of the very last layer (but no lemon curd).
Add the first layer of chocolate cake, buttercream, and then a generous slather of chocolate hazelnut spread. Add the second chocolate cake layer and buttercream.
Using a large cookie cutter that's slightly smaller than the chocolate cake layers, evenly trim both of the vanilla raspberry cake layers for the top tier. If desired, you can swap the chocolate and vanilla raspberry layers (depending on preference).
Add the first vanilla raspberry cake layer, buttercream, then (optional) thin layer of raspberry jam, followed by the last vanilla raspberry cake layer.
Insert 2-3 skewers in the center of the cake to add support. Frost the outside of the entire cake with the remaining vanilla bean buttercream.
Decorate with fresh golden berries and edible flowers to be enjoy!