With the 3 vehicle shapes I liked I then started working on putting together the bits that stood out to me in to one shape.
This is the shape I came up with. I took the base shape from the bottom one of the 3, the spinning outer circle and the front spikes from the top one of the 3. I also took the spikes from the middle one of the 3. I feel that this is a good shape with enough moving part for a game asset to make it look interesting as it moves.