For DD's B'day this year I'm making her a giant cupcake cake and I wanted to do a "rainbow" in side.

Usually when you make a rainbow cake you bake 7 layers separately and then ice them together but obviously I can't with the shape of this tin.

So I was thinking I could pour one colour in, freeze it, pour the next colour and so on, then bake from frozen?

Do you think it would work? Or should I give up and just do a marble cake?

Thanks!