The nice thing about Gorka Morka...you can just make vehicles out of whatever you want.
My buddies and I used to make our own Death Race(ish) cars out of Darda Cars (German wind up cars) covered in clay, putty, and home-fashioned weapons...
No wonder GW killed that one off...
Anyway this is a great little sculpt especially if it's your first 15mm. That scale takes a whole extra layer of talent to do well, I feel.