I am actually working on this over the summer, but I am doing the school girl version and doing one giant claw, as if she is in the process of becoming contaminated. I have been researching it for a while, I had someone suggest a method that involves insulation foam and fiberglass resin, but I am thinking of other ways to still make it large but light enough to wear over my arm (I plan to use a harness to take some of the weight off). I also REALLY want to make the claw pieces move. Once I get started on it I can let you know how it goes!
Cosplay, progress pictures, tips, tricks and tutorials! All are located on my page, even some reviews of costumes that I have had commissioned or wigs that I have bought https://www.facebook.com/mirascarletcosplay