- Is there a way to do this cake and make it to serve approx 50 people? I'm having a hard time figuring this out as I'm bad at calculating shaped/custom cake servings! Please help! Thank you in advance!

I'm bumping and following to see if anyone with extensive carving experience chimes in. I have made carved cakes, I have one in a couple of weeks to do. So far mine have been fairly simple shapes. I make templates that I follow to figure out my slice count. You might be able to do something similar?
It appears to me that this is basically a round cake. I would just factor in a few extra servings to allow for the tapers top edge.
http://www.wilton.com/cake-serving-guide/cms-baking-serving-guide.html
This is my go to when trying to decide what size cake to make. You can either make a very large helmet, or you could make a two tiered cake where the helmet is the top tier if you want to stick with a smaller sized helmet.
The industry standard is for a serving of 1"x2"x4". This looks to me to be more than 4" tall so I would put anything over 4" on a seperate board to be treated as another cake. Use the 1/2 ball pan (Wilton offers several sizes or bake it in a bowl) and figure how many serving from a round that size. I' probably would use a 10"X3"or4" as the base and bake up a bowl cake for the top. That should give you around 50 servings easily. Be sure to give the customer a drawing of how to cut it to get that many servings!
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