Uni the Shell

We are talking about creating a new enemy and some thought has going towards an 'urchin' style tank.  Here are some early stabs at the new type.

This is just a collection of different looks for the tank's shell.

Here is a nice combo of two shell types mashed together.

Underneath the shell there will be some retractable tank treads to provide the illusion of mobility.  Although if push comes to shove the treads can be done away with and a simple dust particle effect, like the one we've been using, would be acceptable.