That looks really fantastic!
For the claws, may I suggest making a paper mache (or however it is spelled! lol) mold, fitted to your fingers. Then, coat it with Bondo and Mod Podge to keep it durable. Then you can slide them off and on, maybe even keep them attached with spirit gum or some kind of body glue. Or, look up a guide for making Witch claws (from Left 4 Dead) and alter it.
As for the footless thing...in case you didn't figure something out, you could just get a pair of flip-flops, paint them read to somewhat match you, then get clear straps and use them instead of the normal strap things that flip flops have.
Your cosplay is really phenomenal though D: good job!
-Mako (Kill la Kill)
-Popstar Ahri (League of Legends)
-Jill Valentine (Resident Evil 5)
-Ada Wong (Resident Evil 4)
-Poison (Final Fight)
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