So, I am making DD's 7th birthday cake, with the letters of her name made out of cake, kinda like this. Fortunately she only has a short name and all the letters are made of straight lines, not curves, so the plan is to bake several rectangular cakes and carve them up.
I'm then going to cover in buttercream (possibly coloured) and put skittles and smaller round sprinkles on top, with edible glitter, and an sparkler in the shape of a number 7, for extra bling.
What kind of cake would you use for the actual cake? Would madeira be better than plain sponge, in terms of being able to be cut nice and neatly? Would it taste as nice? (I do like a nice fluffy light sponge, and madeira seems a bit heavy / dense to me).
Advice gratefully received!