Okay, I've made some progress
Motors from ranglebox are on their way, and I've made a new claw design:
newclaw.png
Still not sure about materials for the claw, and I imagine that might have an impact on the design.
Right now though what I'm most unsure about is the ESC. Since the 10a one from ranglebox is out of stock I'm pretty lost on what to get. I looked at the recent thread asking for alternatives, but the hobbyking one that looked like the best choice for me in that thread is also out of stock. Any guidance on what I should be looking for in alternatives would be great.
Also, I'm not sure if the servo for the claw should go through the ESC or connect straight to the receiver. I'm guessing that latter?