This four-legged walking vehicle or “strutter” was a main character in Dinotopia: The World Beneath. It's based on the design of a ceratopsian, with the passenger seat built into the pelvis area, and the driver's seat between the scapulas. This is how it appeared after the head/windshield was bitten off by a T.rex.
I built the original reference maquette (below) by “kitbashing,” or combining parts from about four different Japanese robot plastic model kits and filling in extra shapes with two-part sculptor’s putty. The reference maquette was just a start in conceptualizing the design, but it gave me a lot of information, especially for unusual angles.
You can often find unbuilt plastic models at yard sales, and they make good raw material for kitbashing. The front section of the vehicle above was originally the torso of a humanoid Japanese robot.
Denison’s strutter was one of the toy prototypes made by the concept development team at Hasbro based on the illustrations in The World Beneath. This model shows the full strutter, complete with its head, and the windshield built into the frill. The prototype can walk...sort of—you can see the linkage bars behind the front legs—though the challenge with a real toy is to make it strong enough to be manhandled by toddlers.
Model builder Glenn Ludgate of Australia has built several scratch-built one-of-a-kind Dinotopia vehicles as hobby projects. Here's one of Arthur Denison's strutter in progress.
More about the Hasbro Dinotopia prototypes, link.