DS is just about to turn 4 (yikes - please slow down little man ). He is having a batman party and I have to make a batman cake. I'm going with a traditional buttercake and have purchased royal icing or fondant in the 'batman colours' to decorate however unsure on what I should use to 'ice' the cake before I put the fondant on. I had intended initially to do a ganache however not sure if this will really work with the buttercake and if it was more suited to a chocolate cake. (Assuming here my understanding of how to make a ganache is correct - chocolate and cream? Would I be better off making a butter cream and using this instead.

The cake will be rectangular so to get the height I will need for my design - batman skyline round the side - I think I will need to make two cakes and then layer the buttercream in between the two cakes and on the sides?

Will this work? Is butter icing the way to go?

DH has slightly freaked me out by saying how much work I'm setting myself up for when I showed him the list of things I want to do food wise but I think I can manage. Party is on Sunday afternoon so was planning to maybe make the cake Friday night, glad wrap when cool and store in fridge. If I do that can I make the butter icing (if thats the way I go) on Saturday day put on cake and then put the fondant on Saturday night. At that stage then I'd only leave the cake out over night into Sunday?

Also any tips for rolling out and being able to land smoothly on the cake?

TIA