I don’t have a concept sketch or 3d rough yet but I wanted to get my idea out before someone else steals it 
I’m going to do a large turtle that will be capable of dragging HUGE loads behind him albeit at a slow speed. He’ll probably be showing a grumpy/angry look , I don’t think turtles like working very much. I’m at work right now and don’t have access to photoshop so I’ll post a concept sketch when I get home later tonight.
Be forewarned, I’m horrible at drawing so don’t expect too much from me.
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