You may remember Mike did a Grot tank model after being inspired by Grot tanks on Jeff Hall's blog The Adept's Forge
You can see Mike's Grot tank here.
I had an extra tank looking chassis from a Micro Art Studio Iron Brotherhood model, and I decided to make a Grot tank with it.
I added a few bits, a Goblin head and a Tamiya German helmet. The hatch is a Goblin fantasy shield.