I made one week before last - my first Topsy Turvy -- and I was really pleased with it. It's the Mardi Gras cake in my photos.
I just iced and decorated both tiers separately, then placed the top one on the bottom one, added the border and drove a pointed stake through both into the base.
Here's a great video:
I've only made one topsy turvey cake, and at first I covered it in buttercream, but it fell, so then I covered the part I salvaged in fondant. There are pictures in my photos. I thought the buttercream was much more difficult than the fondant, but my buttercream skills are a little weak.
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