I have to make a Dora cake. I would really like to make a topsy turvey cake, but the client only wants buttercream 
I have only made one topsy turvey and that was with fondant--so fun and easy. Is it really hard to do with buttercream? I'm specifically wondering how to stack them without smashing the buttercream in and not so sure about smoothing it so it looks nice...........should I go for it or just do something else?
Go for it. I made mine in buttercream. If you use the method where you crumb each tier and then cut out the tops to fit the next layer, you'll have no problem. Just let each tier firm up in the fridge or freezer. Assembly is like any tiered cake. And, once assembled, you just pipe a border as you would with any cake.
I would even frost in a final color before assembling the tiers. Extra decoration can be added after assembly. That worked best for me. You don't get the weird angles for frosting the layers that way.
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