In that case, bake tonight, wrap with saran wrap, & chill overnight. Fill tomorrow early morning. Late tomorrow night, final coat & set overnight. Friday morning, cover with fondant, stack, & decorate.
Do you have any kind of cardboard box at all? It doesn't have to be a fancy cake box. Honestly, you don't even need a box if you the decorations aren't crazy colors that might bleed. I've used moving boxes & cut the side with an exacto knife.