It's looking pretty robotic and sciency back there now. Awesome.
I realized that I need to install more nuts in the top of the head, but still have access to it. So I chopped the back half of the resin shell in two, and resined it to the front half.
As i'm doing this, i'm keeping in mind future acces and repairs - i've got to be able to get back inside when shit breaks. Which i'm sure it will. I'm thinking that the 'skin' will be glued to the shell as little as possible, if at all. And the lower-back part of the head will bolt on, instead of being resined on.