I'm an 'over the top' kind of gal... and that seems a little over the top to me!! Unless you want to do a single layer like 6-4-2... or maybe even 4-2-1... but that may be a bit of a pain to carve the cakes that small. ?? Good question though, I'm interested to hear what people say, I've never hear about anything other than the 6' smash cakes.
I've used this pan
http://www.pastrychef.com/THREE-TIERED-CUPCAKE-PAN_p_1756.html
A three tier cake is going to look like a wedding cake. The reason for doing a smash cake is so that the baby can stick his/her fingers all over it and that's why you keep it small. If you make it a three tier you'll need to put dangerous things in it to keep the cake stable. Things a small child may choke on.
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