I am not sure but here's a bump because I would like to know too.
No problem!! I made one not too long ago, and it was yummy!!
I also have used a springform pan. I baked a cake in it, then removed. Let icecream soften. Cut the cake in half, put cake then icecream, then on the icecream I mixed crushed cookies and fudge sauce, I then topped with cake and decorated, it was yummy! 
I used to work for Publix and when we made ice cream cakes, we would just take a container of ice cream, cut it into equal pieces and lay it on the bottom layer of cake, then place the top layer of cake on and ice it and decorate it as usual. Just make sure you either work fast and place the cake in the freezer in between so it can stay frozen.
Instead of a cake mix, I like to use a brownie mix for my ice cream cakes. It's denser and holds up well while ice cream is becoming firm again. The kids really like the richness. Good luck!
you can make or buy fudge sauce and ice with any topping.
Did you just use plain whipped topping (like Cool Whip)? I saw something that said mix 1/2 whipped topping and 1/2 softened ice cream. Have you ever done that? If so, can I use vanilla icecream and tint it usingthe icing colors? Did the buttercream not crack? I'm just not sure what king of icing to use.
I've never used cool whip. I made the whipped topping from scratch, using heavy whipping cream and sugar. I've also used the colors with the buttercream and it was just fine. I think they both taste good on top, so it's more of a preference on taste than one you "need" to use.
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