ISO: death by chocolate

hi all my great aunt used to make this death by chocolate mouuse thingy she had this big bowl and layered it with moose cake and whiped cream as well as crushed toffy bars and choco morsels. can i use store bought ready made pound cake choco and vanilla im going to douse it in khalua but how much should i use a half a cup or a cup. do i use pudding or mouse mix. and what other suggestions do u have in terms of toppings. i waws thinking of walnuts and heath bars but could use some sugestions as to how to make this dish.