Okay, I have never done a dummy cake before with styrofoam. Is it necessary to use any kind of supports in the styrofoam when doing a stacked cake or is one of the beauties of the styrofoam that you can avoid that? Silly question, I know. Be patient with me!

just ice and stack. if using buttercream, it does take longer to crust. if fondant, several 0n this site say to sand the top edge so it is softer and doesn't cut your fondant, but i hate fondant except for small decorations and accents.l
hammer1

Have you ever tried to stand on styro? It holds a ton! NO supports needed.

Great! Thanks so much.

Great! Thanks so much.

no need to dowel for support but if you are stacking you might consider one long one down the center to keep your layers straight