I have been contacted about doing this cake for a Sweet 16 in September. (So lots of time to practice)... but I need to figure out a cost and what cakes will be involved for something like this. The cake is for about 65 people so I'm considering doing the top out of rice krispies or something. but what sizes should all of this be?

As of right now I'm planning on carving this because I can't justify buying $100 worth of cake pans for this one cake.

Any suggestions?

Yes, you are certifiably nuts. Welcome to the club!

This looks like 6" - 8" - 10" which will serve 74. There will be minimal carving because this one has straight sides, which means you would use regular round pans. You would just make an extra layer to carve the slant on top.

As far as price, no one can answer that one for you. You need to figure your costs and add a profit margin. Or charge per serving. HTH

It's a simple enough design, so no worries there. YOUTUBE how to carve and stack topsy turvy cakes. I find teenagers eat a lot so I would've done a cake, but rkt sound good too. Discuss it with the parents (or whoever is paying) and have them decide. As for price....your call. Sorry.

I'm dying to try one, but haven't had anyone need that much cake. From what I understand though, the topsy turvy is an illusion. You bake up three layers for each tier, angle the top tier and cut a hole in the center of it to fit in the top tier. It's my understanding that making the hole just the right size is the difficult part. I've also read that it works best if you have at least a four inch size difference between the tiers, such as 6" and 10" tiers. Make sure you use a good support system. Best of luck to you!