There is nothing behind the plastic stakes. Once you chisel the head off, that is it. The screws are all obviously screws. Just need to find all of them. It's either a screw or a little bead of plastic (the stakes).
I got rid of my GP a month or so ago so I can't get any pics for you. From what I remember, the screws were the easy ones to find. There was a stake that took me forever to find. I drilled most of them out but the last 2-3 I had to chisel. I know this isn't much help, but... It's all I got.
