For my arms, I am using four 3" black drainage pipes. For the claws, I used MDF Fiberboard. I am probably going to seal the claws with glue or something because they are definetly not very sturdy. My plans are making two arms move and the claws would open/close with a pull of a string. Trying figure out if it will work running the rope through my sleaves. I used 50lb fishing line for the claws. At the end of the drainage pipe, I have it tied to a key ring for easy access. As you can see I, I mounted the springs on the outside so the claws would open automatically when i release the string.
For my other two arms, I was thinking of securing a mannequin to one of them dressed as Mary Jane. We all know that there is some creepy spider-man person at these events. The other arm, I was going to mount a eye hook at the top and run a piece of rope through the tube and down my leg. The concept is that the arm would move when I walk. Haven't tried this out yet.