yes. I think u will be surprised how easy the styro can be.
get the basic shape you want with a knife
then use a hunk of styro as your "sandpaper" and finish off the shape using that. it files it down wonderfully, and allows to tweak the shape just as u want it.
That's what I usually do to make odd shapes, I just did a bunch of apples for teacher's retirement cakes last month, that worked out well. For some reason this didn't seem like a rice krispie kinda shape.....I don't know why? Maybe I'll play around with some styro and see.
Thanks for the quick replies!
I would just shape/carve cake to shape. I have a 'thing' for prefering it to be completely edible where possible 
I've done a couple very similar cakes before when I was working at the bakery, and just carved cake for it. Simple, easy, cheap... You'll need an extra layer the same size as the top tier, or one size larger if you're more comfortable with that, and carve it to a taper. Keep rotating the cake to make sure you get the shape even all the way around.
Deanna
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