Prop/cosplay help

Hey guys. Not too long ago, I was on social media browsing when I saw this pic of a guy that building a scuttle crab cosplay (yes he fit himself into the shell and everything. I saw it and wanted to recreate something like that, as I will be going to an expo later this year and wanted to do an unexpected cosplay. If anyone knows anything about prop building or experience with cosplay, then can someone recommend me what materials should I use or what do you guys use for some of your props and armor pieces. I’ve already talked to some cosplayers and a good amount of them said they use foam (I think it’s called EVA foam). Any help/advice would really help, as I’m sort of knew to this. Thanks.
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