First Test Design
At the very beginning it was planned to make the Grievers as big robotic machines. However I had already created this Test Design, before I got the job, which showed the hybrid creature idea from the novel. I presented the design to Wes and he loved it. I pretty much completed the design in this first concept, we only added a few attachments afterwards in order to make them more threatening. Slugs and coconut crabs were big influences for me in finding the overall body shape. The head is a mixture of caterpillars, bulldogs and piranhas.
Since we see the Grievers mostly in the dark, Wes wanted to find a way to illuminate them with some kind of 'light dots' and sensors. This is one of a few options that I sent to him. One idea was to put these lights underneath the slightly translucent skin which would constantly move in one direction.
Early Beetle Blade variations
The Beetle Blades didn't end up in the film, but I had a blast working on them. There were a few fun scenes in the script. Wes described them as the 'observation cameras' from the maze, therefore I attempted to make the design very functional. At the very beginning we thought about making them bio-mechanical, similar to the Grievers. Wes wanted something like a mutated and scary looking sowbug.