MeraForum Community.No 1 Pakistani Forum Community - Rose and chocolate wedding cake

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Ingredients
For the base:
235g unsalted butter, softened
410g caster sugar
4 large eggs, beaten
105g self-raising flour
280g plain flour
1¾tsp bicarbonate of soda
95g cocoa powder
280ml sour cream, at room temperature
70g full-fat cream cheese, at room temperature
For the top layer:
100g unsalted butter, softened
165g caster sugar
2 large eggs, beaten
50g self-raising flour
115g plain flour
½tsp bicarbonate of soda
45g cocoa powder
110ml sour cream, at room temperature
30g full-fat cream cheese, at room temperature
For the vanilla buttercream:
750g icing sugar
100g unsalted butter, softened
1tsp vanilla extract or vanilla bean paste
For decoration:
160 10cm tall dark chocolate cigarillos
40-70 small trimmed roses, unsprayed and untreated
You will also need:
A 25cm and a 15cm round springform or loose-bottomed cake tin, buttered and the bases lined with a disc of buttered baking parchment
A disposable piping bag
3 cake dowels