Thank you everyone so much for the support. You don't see too many comic builds on here, it's a shame. But your encouragement just fuels me to keep going!
Davy, it's called Roma Plastilina, a medium oil clay by Sculpture house. It does the job, but I wouldn't recommend it. It's too soft, and the hard is too hard. If you're looking for a good oil clay, you can't go wrong with Chavant.
Judge, I had planned on putting the rivets on my throw away before final molding, but seeing as how you have first hand knowledge, I might just wait until the final piece before painting. Thanks for the idea!
I think I've found a good fabric for the cape and hood- its called Chenille upholstery fabric. It's got a nice heavy weave to it, but is very soft. But very expensive, at almost $15/ yard. So we'll see.
Thanks again everyone!